Pretty simple, yet powerful background image generator. Choose a color, pattern, blend mode, and intensity. Then download the image and have it tile to fit your needs.
I was monster trucking on the web, surfing is so web 2.0, for a classy background image generator for a project I was working on. All of a sudden behind a search engine pile of hay bales I found this little site just flexing. I clicked and boom, made a tasty bg image.