So far, this website features a very useful 3D models download page , to which every user can contribute.
I suggest you do the same with textures. I have photographed quite a few surfaces and arranged them into neat seamless textures which others might find useful for their projects. I would gladly share them with others, and I think the SH3D website would be the most appropriate place.
If you decide to open one, I'm game. [:)]