Okay I took your image above and ran with it - hope you don't mind.
Here is a color map amd a bump (texture) map - just cut the image in half, save as their own TIF image and put them on a wall to see what it is.

The light colored wall and the maroon bands are seperate layers (I also added color to your rust, and some streaks that aren't that noticeable) that I masked part of to see the nasty rust texture underneath. You can also use this technique to have cement block, bricks, wood, whatever you want underneath as well.

Lemme know if this is something you're looking for - hope it helps!
-Lew ;-)