Generated by SassMeister.com.

SassMeister-input.scss

// ----
// Sass (v3.3.0.rc.1)
// Compass (v0.13.alpha.10)
// ----

//--------------------------------------------------------//
// defining your map:
$brand_clr: (home: blue, about: orange, contact: yellow);

/*--------------------------------------------------------*/
/* iterating the map with @each */
@each $brand, $clr in $brand_clr {
  body.#{$brand} {
    background: $clr;
  }
  // and so on for other rules with brand specific styling
}

/*--------------------------------------------------------*/
/* or using the map-get() function */
body{
  &.about {
    background: map-get($brand_clr, about);
  }
}

/*--------------------------------------------------------*/
/* using mixins */
$color: null;
@mixin branding {
  @each $brand, $clr in $brand_clr {
    &.#{$brand} {
      $color: $clr;
      @content;
    }
  }
}

body {
  @include branding {
    background: $color;
  }
}
button {
  /* general button styles */
  @include branding {
     color: $color;
  }
}

SassMeister-output.css

/*--------------------------------------------------------*/
/* iterating the map with @each */
body.home {
  background: blue;
}

body.about {
  background: orange;
}

body.contact {
  background: yellow;
}

/*--------------------------------------------------------*/
/* or using the map-get() function */
body.about {
  background: orange;
}

/*--------------------------------------------------------*/
/* using mixins */
body.home {
  background: blue;
}
body.about {
  background: orange;
}
body.contact {
  background: yellow;
}

button {
  /* general button styles */
}
button.home {
  color: blue;
}
button.about {
  color: orange;
}
button.contact {
  color: yellow;
}