Post one of the images, and give me a quickie guidline of what you wanna achieve. I think I know a good way to do it, and be able to edit later, but I'm not exactly sure it's what you're going for...

Just rough brush strokes would be fine to illustrate your goal - like I said, I think I know how to do it/how you can do it.

Talk to ya soon-
-Lew ;-)