Colour Palette Function based on Stuart Robson's Mixin http://alwaystwisted.com/post.php?s=2013-04-07-sassifaction-in-colour-palette-mixins

colourpalettes

@function colorize($color, $change: n) {
  @if $change == l1 {
    @return tint($color, 10%);
  }
  @else if $change == l2 {
    @return tint($color, 25%);
  }
  @else if $change == l3 {
    @return tint($color, 50%);
  }
  @else if $change == l4 {
    @return tint($color, 75%);
  }
  @else if $change == d1 {
    @return shade($color, 10%);
  }
  @else if $change == d2 {
    @return shade($color, 25%);
  }
  @else if $change == d3 {
    @return shade($color, 50%);
  }
  @else if $change == d4 {
    @return shade($color, 75%);
  }
  @else {
    @return ($color)
  }
}

SCSS usage:

body {
color: colorize($baseColor,l4);
background: colorize(#fff,d2);
border: 1px solid colorize($borderColor,d3);
}