Цвета подставить через цикл From http://sassmeister.com/gist/10450406

scss_for_loop_colors.scss

// ----
// Sass (v3.3.4)
// Compass (v1.0.0.alpha.18)
// ----

// List of colors
$colors_list: red, blue, green;

// Map of colors
$colors_map: (
  "red": #f01,
  "blue": #10f,
  "green": #1f0
);

// Number of elements
$n: 2;

// @for loop for lists of colors
@for $i from 0 to $n {
  div:nth-of-type(#{$i+1}) {
    /* first loop */
    background: nth($colors_list, $i % length($colors_list) + 1);
  }
}

// @for loop for maps of colors
@for $i from 0 to $n {
  div:nth-of-type(#{$i+1}) {
    /* second loop */
    background: nth(nth($colors_map, $i % length($colors_map) + 1), 2);
  }
}