Contextual SCSS theming mixin

themes.scss

$brand: (
  'turquoise': #5C9AB1,
  'red': #FF495C,
  'green': #6ECB98,
  'yellow': #FFC700,
  'orange': #FF6B00,
  'blue': #009BDE,
  'purple': #A35EB5
);

@mixin themes($properties) {
  @each $name, $value in $brand {
    .is-theme-#{$name} & {
      @each $property in $properties {
        #{$property}: $value;
      }
    }
  }
}

// Usage:
/*
.my-class {
  @include themes(background-color border-color);
}
*/