I've only been making textures for a while now, but everyone seems to love them. I know I can't ever get enough textures either. So I've been surfing and made a list of sites that offer free textures to download. Some have more than others, and some sites have higher resolution images than others, but they all have one thing in common, free downloads.
5. CG Textures
Oddly enough, this site doesn't have a logo ;o
Click on the categories on the right.
Another site with no logo. The site is a little broken, just click on the categories on the side.
Scroll down to see the textures