Julianne's Background Textures
The Backgrounds Archive
The Background Sampler
http://www.netcreations.com/nc-cgi/pat-back.pl/tex9-6.gif
The Wallpaper Machine
Josh's Tilable Image Gallery
The Clip Art Connection: Background Images Archive Main Menu
Axem Textures
Realm Graphics: Backgrounds
Turman Brown's Texture Woild
Texture Station