I have a new addictive IPhone App. Create and maintain color palettes on your IPhone with Palettes. I'm currently using the free trial version, Palettes Lite.
You can import color palettes also from images taken with your IPhone. Upload URLs to create palettes from the colors used on websites.
Create new colors by blending colors from your palette (example below).
Preview your palette colors against black and white.
Create your own colors.