If you do even a little bit of web or graphic design, you might have run into a cool poster or product label somewhere and thought “I like this color scheme.” ColorSchemer Touch is a neat iOS app that will help you out with those situations. If you snap a photo, it will let you tap colors within it and build a color palette.
It also has a couple of manual color pickers, including a basic color wheel and the nifty “LiveSchemes” tool, and integration with Colour Lovers. So you can browse and save other palettes as well as creating your own. You can easily email color palettes or save them to your camera roll, as well as syncing them to Color Lovers.
ColorSchemer Touch is currently free on iTunes, though I believe it is usually $2.99.