You can download and use any of these free textures, but please keep in mind that you are NOT allowed to sell, redistribute, or modify these textures to claim them as your own. Doing that would be uncool.
DesignShard Stained Paper Textures
Free Stock Textures
Gracey’s Free 3-D Textures
DesignShard Concrete Textures
Link to texture downloads
Note: Post credit to http://www.urbandirty.com/
Note: Cannot be used in scrapbooking.
Mayang's Free Textures
NOTE: Limit of 20 free downloads per day