Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.4.14)
// Compass (v1.0.3)
// ----

@mixin theme($themename, $color1, $color2) {
  .#{$themename} {
    .button {
      color: $color1;
    }
    h1 {
      background: $color2;
    }
  }
}

$themes: (
  pink: #fff #000,
  red: #faf #0a0
);

@each $name, $colors in $themes {
  /* Theme ##{$name} */
  @include theme($name, nth($colors, 1), nth($colors, 2));
  /* end Theme ##{$name} */
}

SassMeister-output.css

/* Theme #pink */
.pink .button {
  color: #fff;
}
.pink h1 {
  background: #000;
}

/* end Theme #pink */
/* Theme #red */
.red .button {
  color: #faf;
}
.red h1 {
  background: #0a0;
}

/* end Theme #red */