I picked up one of these Petite Pattern Books over the weekend and am probably going to buy the entire Series. The book/disc features 140 creativity-inducing patterns. You can use them as backgrounds, screen-savers, wrapping paper, textiles, book covers, you name it. You can use any pattern as is, or change size and color to your liking. All are presented in EPS files for Illustrator and JPEG files. A fabulous little resource.
Petite Pattern Books, $23.48 at Amazon