Collect and share color swatches, then use them in themes. Easy peasy.
Collect color schemes. Use 'em, display 'em, go nuts.
LB Colorbox is a new way to collect color schemes and tuck them away inside of WordPress for safe keeping. If you've ever admired the palettes available at ColourLovers, StudioPress, Colllor or elsewhere, you can now recreate that functionality from the safety of your own WordPress home. It stores your swatches as Custom Post Types inside of WordPress.
You can also directly import color schemes from Adobe's Kuler service. You'll need to apply for a Kuler API key in order to use this feature, but once you've done so, a wealth of options are available to you.