Created a single control point for adding column-classes to the sassygrid by adding sass-loops and an array of column-classes. Related to spree PR https://github.com/spree/spree/pull/2221

01_sassygrid.scss

//---------------------------------------------------------------------------------------------------
// a sassier grid for spree
// fixed-width - html whitespace not removed.
// intended to be used as magic-classes, coupling markup&style.
// based on skeleton v1.1 by dave gamache - thanks dude
//
//---------------------------------------------------------------------------------------------------
//- Contents
//--- Grid classes
//--- Grid Variables
//--- Grid Mixin
//--- Desktop
//--- Tablet
//--- Mobile

//-------------------------------------------------------------------------------------------------------
// grid classes
// to add another column, add a  class this list here.
// ONLY here.

$column-classes: (
  one,
  two,
  three,
  four,
  five,
  six,
  seven,
  eight,
  nine,
  ten,
  eleven,
  twelve,
  thirteen,
  fourteen,
  fifteen,
  sixteen
  );

//-------------------------------------------------------------------------------------------------------
// grid variables

// get the count of the column classes.
$column-count: length($column-classes);
$gutter: 20px;
$desktop-container-width: 960px;
$tablet-container-width: 768px;
$mobile-container-width: 90%;
$mobile-column-width: 100%;

//--------------------------------------------------------------------------------------------------------
// grid mixin
@mixin sassy-grid($grid-container-width, $grid-column-count:$column-count, $grid-gutter:$gutter) {

  $grid-column-width: $grid-container-width/$grid-column-count;

  .container {
    width: $grid-container-width;

    .columns, .column {
      @for $i from 1 through $column-count {
        $current-column-class: nth($column-classes, $i);
        &.#{$current-column-class} { width: #{$i*$grid-column-width - $grid-gutter}; }
      }//@for

      &.one-third    { width: ($grid-container-width/3) - $grid-gutter; }
      &.two-thirds   { width: (($grid-container-width/3)*2) - $grid-gutter; }
    }//.columns


    // offsets
    @for $i from 1 through $column-count {
      $current-column-class: nth($column-classes, $i);
      &.offset-by-#{$current-column-class} { padding-left: #{$i*$grid-column-width}; }
    }//@for

  }//.container
}//@mixin

//---------------------------------------------------------------------------------
// desktop
.container {
  position: relative;
  margin: 0 auto;
  padding: 0;
}//.container

.column, .columns {
  float: left;
  display: inline;
  margin-left: $gutter/2;
  margin-right: $gutter/2;
  &.alpha { margin-left: 0; }
  &.omega { margin-right: 0; }
}//.column,.columns

.row { margin-bottom: $gutter; }

@include sassy-grid($desktop-container-width, $column-count, $gutter);

//-----------------------------------------------------------------------
// #Tablet
@media only screen and (max-width: 959px) {
  @include sassy-grid($tablet-container-width, $column-count, $gutter);

  .container { width: $tablet-container-width; }

  .column, .columns {
    &.alpha { margin-right: 10px; }
    &.omega { margin-left: 10px; } }//.column,.columns

  .alpha.omega {
    margin-right: 0;
    margin-left: 0; }//.alpha.omega
}//@media

//--------------------------------------------------------------------
// #Mobile
@media only screen and (max-width: 767px) {
  .container {
    width: $mobile-container-width;

    .column, .columns {
      margin: 0;
      @for $i from 1 through $column-count {
        $current-column-class: nth($column-classes, $i);
        &.#{$current-column-class} { width: $mobile-column-width; }
      }//@for

    }//.column,.columns

    // offsets
    // offsets
    @for $i from 1 through $column-count {
      $current-column-class: nth($column-classes, $i);
      &.offset-by-#{$current-column-class} { padding-left: 0; }
    }//@for

  }//.container
}//@media


//------------------------------------------------------------
// Use clearfix class on parent to clear nested columns,
// or wrap each row of columns in a <div class="row">
// You can also use a <br class="clear" /> to clear columns
@mixin clearfix {
  clear: both;
  display: block;
  overflow: hidden;
  visibility: hidden;
  width: 0;
  height: 0;
}//@mixin

.clear { @include clearfix; }

.clearfix, .row, .container {
  &:before, &:after { content: ' '; @include clearfix; }
}//.clearfix, .row
// Note that the clearfix could be better placed in a utilities file.
// However the context of grid layout does give some justification for the coupling.
//---------------------------------------------------------------------------------------------------

02_sassygrid_output.css

/* PS: thanks to http://cssconvert.mgwebsolutions.net/ for the quick converter */

.container {
  position: relative;
  margin: 0 auto;
  padding: 0; }

.column, .columns {
  float: left;
  display: inline;
  margin-left: 10px;
  margin-right: 10px; }
  .column.alpha, .columns.alpha {
    margin-left: 0; }
  .column.omega, .columns.omega {
    margin-right: 0; }

.row {
  margin-bottom: 20px; }

.container {
  width: 960px; }
  .container .columns.one, .container .column.one {
    width: 40px; }
  .container .columns.two, .container .column.two {
    width: 100px; }
  .container .columns.three, .container .column.three {
    width: 160px; }
  .container .columns.four, .container .column.four {
    width: 220px; }
  .container .columns.five, .container .column.five {
    width: 280px; }
  .container .columns.six, .container .column.six {
    width: 340px; }
  .container .columns.seven, .container .column.seven {
    width: 400px; }
  .container .columns.eight, .container .column.eight {
    width: 460px; }
  .container .columns.nine, .container .column.nine {
    width: 520px; }
  .container .columns.ten, .container .column.ten {
    width: 580px; }
  .container .columns.eleven, .container .column.eleven {
    width: 640px; }
  .container .columns.twelve, .container .column.twelve {
    width: 700px; }
  .container .columns.thirteen, .container .column.thirteen {
    width: 760px; }
  .container .columns.fourteen, .container .column.fourteen {
    width: 820px; }
  .container .columns.fifteen, .container .column.fifteen {
    width: 880px; }
  .container .columns.sixteen, .container .column.sixteen {
    width: 940px; }
  .container .columns.one-third, .container .column.one-third {
    width: 300px; }
  .container .columns.two-thirds, .container .column.two-thirds {
    width: 620px; }
  .container.offset-by-one {
    padding-left: 60px; }
  .container.offset-by-two {
    padding-left: 120px; }
  .container.offset-by-three {
    padding-left: 180px; }
  .container.offset-by-four {
    padding-left: 240px; }
  .container.offset-by-five {
    padding-left: 300px; }
  .container.offset-by-six {
    padding-left: 360px; }
  .container.offset-by-seven {
    padding-left: 420px; }
  .container.offset-by-eight {
    padding-left: 480px; }
  .container.offset-by-nine {
    padding-left: 540px; }
  .container.offset-by-ten {
    padding-left: 600px; }
  .container.offset-by-eleven {
    padding-left: 660px; }
  .container.offset-by-twelve {
    padding-left: 720px; }
  .container.offset-by-thirteen {
    padding-left: 780px; }
  .container.offset-by-fourteen {
    padding-left: 840px; }
  .container.offset-by-fifteen {
    padding-left: 900px; }
  .container.offset-by-sixteen {
    padding-left: 960px; }

@media only screen and (max-width: 959px) {
  .container {
    width: 768px; }
    .container .columns.one, .container .column.one {
      width: 28px; }
    .container .columns.two, .container .column.two {
      width: 76px; }
    .container .columns.three, .container .column.three {
      width: 124px; }
    .container .columns.four, .container .column.four {
      width: 172px; }
    .container .columns.five, .container .column.five {
      width: 220px; }
    .container .columns.six, .container .column.six {
      width: 268px; }
    .container .columns.seven, .container .column.seven {
      width: 316px; }
    .container .columns.eight, .container .column.eight {
      width: 364px; }
    .container .columns.nine, .container .column.nine {
      width: 412px; }
    .container .columns.ten, .container .column.ten {
      width: 460px; }
    .container .columns.eleven, .container .column.eleven {
      width: 508px; }
    .container .columns.twelve, .container .column.twelve {
      width: 556px; }
    .container .columns.thirteen, .container .column.thirteen {
      width: 604px; }
    .container .columns.fourteen, .container .column.fourteen {
      width: 652px; }
    .container .columns.fifteen, .container .column.fifteen {
      width: 700px; }
    .container .columns.sixteen, .container .column.sixteen {
      width: 748px; }
    .container .columns.one-third, .container .column.one-third {
      width: 236px; }
    .container .columns.two-thirds, .container .column.two-thirds {
      width: 492px; }
    .container.offset-by-one {
      padding-left: 48px; }
    .container.offset-by-two {
      padding-left: 96px; }
    .container.offset-by-three {
      padding-left: 144px; }
    .container.offset-by-four {
      padding-left: 192px; }
    .container.offset-by-five {
      padding-left: 240px; }
    .container.offset-by-six {
      padding-left: 288px; }
    .container.offset-by-seven {
      padding-left: 336px; }
    .container.offset-by-eight {
      padding-left: 384px; }
    .container.offset-by-nine {
      padding-left: 432px; }
    .container.offset-by-ten {
      padding-left: 480px; }
    .container.offset-by-eleven {
      padding-left: 528px; }
    .container.offset-by-twelve {
      padding-left: 576px; }
    .container.offset-by-thirteen {
      padding-left: 624px; }
    .container.offset-by-fourteen {
      padding-left: 672px; }
    .container.offset-by-fifteen {
      padding-left: 720px; }
    .container.offset-by-sixteen {
      padding-left: 768px; }

  .container {
    width: 768px; }

  .column.alpha, .columns.alpha {
    margin-right: 10px; }
  .column.omega, .columns.omega {
    margin-left: 10px; }

  .alpha.omega {
    margin-right: 0;
    margin-left: 0; } }
@media only screen and (max-width: 767px) {
  .container {
    width: 90%; }
    .container .column, .container .columns {
      margin: 0; }
      .container .column.one, .container .columns.one {
        width: 100%; }
      .container .column.two, .container .columns.two {
        width: 100%; }
      .container .column.three, .container .columns.three {
        width: 100%; }
      .container .column.four, .container .columns.four {
        width: 100%; }
      .container .column.five, .container .columns.five {
        width: 100%; }
      .container .column.six, .container .columns.six {
        width: 100%; }
      .container .column.seven, .container .columns.seven {
        width: 100%; }
      .container .column.eight, .container .columns.eight {
        width: 100%; }
      .container .column.nine, .container .columns.nine {
        width: 100%; }
      .container .column.ten, .container .columns.ten {
        width: 100%; }
      .container .column.eleven, .container .columns.eleven {
        width: 100%; }
      .container .column.twelve, .container .columns.twelve {
        width: 100%; }
      .container .column.thirteen, .container .columns.thirteen {
        width: 100%; }
      .container .column.fourteen, .container .columns.fourteen {
        width: 100%; }
      .container .column.fifteen, .container .columns.fifteen {
        width: 100%; }
      .container .column.sixteen, .container .columns.sixteen {
        width: 100%; }
    .container.offset-by-one {
      padding-left: 0; }
    .container.offset-by-two {
      padding-left: 0; }
    .container.offset-by-three {
      padding-left: 0; }
    .container.offset-by-four {
      padding-left: 0; }
    .container.offset-by-five {
      padding-left: 0; }
    .container.offset-by-six {
      padding-left: 0; }
    .container.offset-by-seven {
      padding-left: 0; }
    .container.offset-by-eight {
      padding-left: 0; }
    .container.offset-by-nine {
      padding-left: 0; }
    .container.offset-by-ten {
      padding-left: 0; }
    .container.offset-by-eleven {
      padding-left: 0; }
    .container.offset-by-twelve {
      padding-left: 0; }
    .container.offset-by-thirteen {
      padding-left: 0; }
    .container.offset-by-fourteen {
      padding-left: 0; }
    .container.offset-by-fifteen {
      padding-left: 0; }
    .container.offset-by-sixteen {
      padding-left: 0; } }
.clear {
  clear: both;
  display: block;
  overflow: hidden;
  visibility: hidden;
  width: 0;
  height: 0; }

.clearfix:before, .clearfix:after, .row:before, .row:after, .container:before, .container:after {
  content: ' ';
  clear: both;
  display: block;
  overflow: hidden;
  visibility: hidden;
  width: 0;
  height: 0; }