Adobe has a neat, free on line tool called Kuhler (pronounced cooler) that lets you play with color. After you open a free account, you can even upload pictures and pull palettes from them. See my picture below.
Here’s a good tutorial on how to use Kuhler.
What got me on this Kuhler/color obsession? Lindly Haunani and Maggie Maggio’s magnificent new book, Polymer Clay Inspirations: Techniques and Jewelry Projects for Creating Successful Palettes. This winter, a friend and I plan to work our way from one end of the book to the other. When we come up for air, maybe I’ll have something new to show you.