Sass mixin for long shadow (src: http://codepen.io/danieltott/pen/AjKay)

long-shadow-mixin

@function makelongshadow($color) {
  $val: 0px 0px $color;
  @for $i from 1 through 200 {
    $val: #{$val}, #{$i}px #{$i}px #{$color};
  }
  @return $val;
}
/*usage*/
@mixin longshadow($color) {
  text-shadow: makelongshadow($color);
}