These great textures were made by Craig Fortune.
http://www.garagegames.com/my/home/view.profile.php?qid=27414

Synopsis on garagegames.com:

Totally free terrain textures. Free for both commercial use/editing and otherwise.
Free for commercial/non-commercial use detailed crate textures. 256x256 jpgs. Just gimme a holler if you use them.