Create a color palette based on an image at Color palette generator .
This neat free to use tool is created by web developer Jeff Minard, the CPG analyzes the colors in an image and then produces a palette based on it.
I read about this the colour palette generator at the blog "More ways to waste time" by Leah Hennen. You can see several examples on her blog.
Polly Hammett - Monotype with color palette.