Just came across this and you can download the .png for free. Included after you select your pattern, is a amazing editor with just about everything in the book to create that special pattern.
From the Authors:
Add your own colors to 100s of cool FREE pattern designs, or browse from 10,000s of pre-colored patterns using the new seamless pattern background editor. All artworks on this site can be used freely for Blogger and Twitter backgrounds, web and graphic design projects, PhotoShop texture tiles and fills, mobile phone wallpapers and personal artwork, blogs and websites. - If you use the PatternCooler resource for digital commercial projects, then please consider making an appropriate donation. For printed commercial products, please contact me outlining your proposed usage - many thX Harvey Rayner :--)