theme-hunter:
6 Color Scheme Tools
COLORlovers
The biggest resource community for colour palettes as well as patterns. Plus points that they spell “colour”correctly my British way.
Kuler
From Adobe it pretty much works the same way as COLORlovers where you also create your own schemes or edit others accordingly.
Colorotate
This site is a little more interactive and fun with the 3D elements. In addition there are few fun mixing/blending options.
Color Scheme Designer
The Wheel! A great resource for creating schemes as well options for “light-er” or “dark-er” versions.
Pictaculous
There are a few picture-to-colours applications but this is my favourite as, in my opinion, its most accurate. In addition to finding you colours from an image you’ve uploaded, it suggests other similar colour schemes from Colourlovers and Kuler. You can also download swatch files which I find useful.
Color Palette Generator (DeGraeve.com)
If you’re lazy or don’t have the image on your computer, this site lets you use URL’s instead.

also:
Color Matters