I always use Joen Wolfrom's Ultimate 3-in-1 Color Tool to pick fabrics. It's amazing to find that colors that I thought would be in the same family are actually different.
It's so helpful in that it lets you know which color families are monochromatic, complementary, analogous, split-complementary, and triadic. Those words mean nothing to me, but it lets me know which color families will go well together.
http://www.amazon.com/Ultimate-3---1...n-1+color+tool