http://mayang.com/textures/
http://www.cgtextures.com/
http://naldzgraphics.net/freebies/60-extremely-useful-free-concrete-texture-backgrounds/
http://www.youthedesigner.com/2010/09/02/40-plus-various-high-quality-free-paper-patterns-and-textures/
http://www.textureking.com
http://www.highresolutiontextures.com
http://freestocktextures.com
http://www.texturevault.net