Sass comes with many built-in functions to manipulate color Show archive.org snapshot . Some of the more interesting functions include:

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adjust-hue($color, $degrees)
Changes the hue of a color.

lighten($color, $amount)
Makes a color lighter.

darken($color, $amount)
Makes a color darker.

saturate($color, $amount)
Makes a color more saturated.

desaturate($color, $amount)
Makes a color less saturated.

grayscale($color)
Converts a color to grayscale.

complement($color)
Returns the complement of a color.

invert($color)
Returns the inverse of a color.