(Apologies for cross-posting this, but it applies equally to all groups.)
Okay, file this under the "sheer genius" category-- the site COLOURlovers.com not only provides ever-changing color palettes that are ranked by users, but you can download palettes in a variety of formats, including CSS. You can browse palettes by newest, top, or search by specific color combinations.
So, so pretty. Good for adventures in interior design, graphic design brainstorming, or a CSS recharge for your website.