Since it's getting warmer outside I'll probably start walking around with my camera again and thus I'll happily look for things people like you could use
So if you've got something you're interested in - special buildings, architecture, plants, textures, objects, cars, signs, whatever you can image - feel free to post here and I'll see what I can do. (I won't make the textures seamless though )
Also take a look here first: wiki/index.php/Category:Inspiration
There's a collection of pages on the bottom, look through them before requesting please. If you need additional shots of something, just tell me!