Generated by SassMeister.com.

SassMeister-input.scss

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

$c0: black;
$c1: white;
$c2: #e02021;
$c3: #F6F6F6;
$c4: #E6E6E6;
$c5: #4d4c4f;
$c6: #222222;
$c7: #E11B22;
$c8: #cccccc;
$c9: #7ab800;
$c10: #646464;
$c11: #cdcdcd;
$c12: #DF1B22;
$c13: #f2f2f2;
$c14: #cfcfcf;
$c15: #999;
$c16: #808080;
$c17: #999999;
$c18: #f2bf42;
$c19: #0b508f;

$grey:   $c6;
$orange: $c18;
$green:  $c9;
$blue:   $c19;
$red:    $c7;

$themes:    glass-breakage collision park   theft fire ;
$maincolor: $grey          $orange   $green $blue $red ;

@mixin theme($properties, $theming-properties, $lighten:0, $darken:0, $plus:'') {
  @for $i from 1 through length($themes) {
    .#{nth($themes, $i)} & {
      @for $j from 1 through length($properties) {
        #{nth($properties, $j)} :
          #{if(
            length($theming-properties) == length($properties),
            #{if($lighten != 0,
                lighten(nth(nth($theming-properties, $j), $i),
                $lighten
              ),
              if($darken != 0,
                darken(nth(nth($theming-properties, $j), $i), $darken),
                nth(nth($theming-properties, $j), $i)
              )
            )},
            #{if($lighten != 0,
                lighten(nth($theming-properties, $i),
                $lighten
              ),
              if($darken != 0,
                darken(nth($theming-properties, $i), $darken),
                nth($theming-properties, $i)
              )
            )}
          )} #{unquote($plus)};
      }
    }
  }
}

body {
  @include theme(background, $maincolor);
}

SassMeister-output.css

.glass-breakage body {
  background: #222222 ;
}
.collision body {
  background: #f2bf42 ;
}
.park body {
  background: #7ab800 ;
}
.theft body {
  background: #0b508f ;
}
.fire body {
  background: #E11B22 ;
}