Generated by SassMeister.com.

SassMeister-input-HTML.html

<ul>
 <li class="dark"></li>
 <li class="brand-dark"></li>
 <li class="brand-color"></li>
 <li class="brand-light"></li>
 <li class="light"></li>
 <li class="brand-compliment"></li>
</ul>

SassMeister-input.scss

// ----
// Sass (v3.4.13)
// Compass (v1.0.3)
// ----

// things to mix
$light: #ff0;
$brand-color: #88d9e6;
$dark: #c69;
$brand-dark: mix($brand-color, $dark, 60%);
$brand-light: mix($brand-color, $light, 40%);
$brand-compliment: mix($light, invert($brand-color), 20%);

// variables
.dark {
  background-color: $dark;
}

.light {
  background-color: $light;
}

.brand-color {
  background-color: $brand-color;
}

.brand-dark {
  background-color: $brand-dark;
}

.brand-light {
  background-color: $brand-light;
}

.brand-compliment {
  background: $brand-compliment;
}

li {
  width: 60px;
  height: 60px;
  display: inline-block;
}

SassMeister-output.css

.dark {
  background-color: #c69;
}

.light {
  background-color: #ff0;
}

.brand-color {
  background-color: #88d9e6;
}

.brand-dark {
  background-color: #a3abc7;
}

.brand-light {
  background-color: #cfef5c;
}

.brand-compliment {
  background: #925114;
}

li {
  width: 60px;
  height: 60px;
  display: inline-block;
}

SassMeister-rendered.html

<ul>
 <li class="dark"></li>
 <li class="brand-dark"></li>
 <li class="brand-color"></li>
 <li class="brand-light"></li>
 <li class="light"></li>
 <li class="brand-compliment"></li>
</ul>