Background Patterns – Seamless

100+ Free Seamless Vector Patterns – Ideal for Web Design and Print Work
Ava7 Patterns – 1546 free seamless background patterns
Background Labs – Background Labs provides a wide variety of seamless backgrounds, patterns, textures and graphics for use in customizing your Myspace pages, twitter, blogs, and websites.
Din Pattern – free seamless patterns
K10K – Pixel Patterns Collection
Noqta – Background pattern library
Pattern 8 – Free repeat patterns
Pattern Head – Free Vector Repeat Patterns
Pattern Shop – Beautiful!
Squid Fingers – and old favorite
Web Treats