[CG Textures] - Textures for 3D, graphic design and Photoshop! is popular, as is the Dundjinni web site.
Google is a good place to start if you'd like to look at too many sites.
I'm lurking the internet and I'm looking for textures for FM8. I so far found Vintyi, any other places than this available?
Also, I'm having issues with simple creation, but this is a question for a different forum. I'm blundering around here, sorry.