Hello, I am going to do an OpenGL project and I need some textures for drawing trees, and road surfaces, the more the better. Do you know any websites where I can find these kinds of pictures? Or, if you have any on your computer, could you please do me a favor and send them to my email address (dkarimi57@yahoo.com)? Best regards, Davood

This recent DevMaster thread comes to mind.

you may find something here

but note that some of these textures don't tile very well. You can fix them up by using the Resyntheze plugin for gimp.