I just saw a very nice open source color scheme called Open Color by heeyeun. The source code download comes with CSS, Less, SCSS, and Stylus variations. You can upload those files straight to CodePen (if you're PRO) and use them as dependancies!

That's exactly what I do here, showing off a few other features as we go in this quick four minute video:

Example:

See the Pen YGxpJP by Chris Coyier (@chriscoyier) on CodePen.