This post has a little bit to do with my work in blender. While I don't have any renders using these (I didn't like how the models turned out, although the textures were beautiful), I still thought that everyone would like to see them. The images were created using GIMP (although I prefer my Corel Graphics Suite, I've since gifted it to my sister, a gifted artist, haha). As a side note, I am releasing them under the creative commons license, so you are welcome to use them if you would like!

A leathery sort of hide, as well as a bump-map to match. I'm not TOO happy with the bumpmap, but it works pretty well in blender if the settings are right. It made a very nice looking sorta, unfinished bumpy hide look. When playing around, I found that a little specular highlight made it look a bit... reptile-ish (but without scales). Good for a satchel or something. There is a known issue with the bumpmap's left and right edges that needs to be fixed.
Also, at higher levels of distortion (normal mapping) and specularity, it made many objects appear to be wet, corroded metal - like a shipwreck on the bottom of the ocean. Most interesting.

Tiles, of course. A little scratched up and everything. I'm going to work on this at a higher resolution, so it'll look better in larger areas of repetition. In the meantime, it's great for use here and there. No bumpmap yet, sorry.
If you want to see how the two images tile, you can view them at the links below. Obviously it's impossible to adjust the resolution when tiled on an HTML page like this, but at least you'll have an idea.
http://netlate.com/img/test.htm - tiles.jpg as background image
http://netlate.com/img/test2.htm - hide.jpg as the background image