Flickr has not only a virtually unlimited selection of exclusively photos, inspiration… but they have also textures.
calebkimbrough photostream on flickr
These textures (photos of materials such as rust, wood, grass, cloth, paper, broken and dirty paper, tiles, clouds, plastic films, natural objects, etc.) can be used for many projects in the digital field – only if the license allows to use the textures. 
You can use the textures for example for 3D graphics applications like Cinema 4D, 3DS Max use, or 2D graphics programs like Photoshop or Fireworks to achieve great effects!
But in animation programs like Adobe After Effects dirty texture (or textures are not specified) fitted very well into projects.
If you know more Texture Resources on Flickr, post it as Comment.
http://www.flickr.com/photos/calebkimbrough/sets/
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