Following is a selection of Web sites with free textures, backgrounds and photography. Check each site for usage rules and restrictions.
Textures
Mayang
ImageAfter
MorgueFile
Animax
Evermotion
CGTextures
Texture Warehouse
Accustudio
CGTalk thread with many links
Bigfoto
Webshots
Kriyayoga
Whoo
link to a database of free stock photography