Remove repetitive code from your life. The problem I needed to solve was that I was writing too many lines of code that was the exact same pattern. This is where Sass shows real strength.

i_to_the_nth_list_loops.scss

// Sass v3.2.5
// Stipe v0.0.5.5
// @import "stipe/manifest";

$color_names: shadow_color href_color form_field_border;
$color_var: $shadow_color $href_color $form_field_border;

@each $name in $color_names {
  $i: index($color_names, $name);
  %#{$name} {
    background: nth($color_var, $i);
  }
}

@each $name in $color_names {
  $i: index($color_names, $name);
  .#{$name} {
    background: nth($color_var, $i);
  }
}

sass_output.css

.shadow_color {
  background: rgba(51, 51, 51, 0.5);
}

.href_color {
  background: #a45454;
}

.form_field_border {
  background: #5c5c5c;
}