// Variables in banners map:  background color, border color, font color
$banners: (
  'green': (
    $color-frost,
    $color-frost,
    $color-green-haze
  ),
  'red': (
    $color-frost,
    $color-frost,
    $color-green-haze
  ),
  'yellow': (
    $color-frost,
    $color-frost,
    $color-green-haze
  ),
  'blue': (
    $color-frost,
    $color-frost,
    $color-green-haze
  )
);

@include banners('banner', $banners);