Texture Warehouse

This site contains thousands of images, all free. Most of them are not tileable, so I would call this site for of a stock photo site rather then a texture site. That being said, the images are very high quality and could be used in various ways, including to make textures from quite easily.

Check out the index of images here, I think you will find them useful. Also, check out our previous tutorial here on how to turn these images into tileable textures. Or, if your just looking for free stock images, enjoy!