I use blue foam sheets to build up the majority of the scenery with WS plaster cloth over the top of that. Sometimes, I use wadded up newspaper on top of the foam and then put WS plaster cloth on top of that. Finally, on top of the WS plaster cloth, I apply wall joint compound with a foam brush or my fingers for more detail. Check out the first layout in my signature for extensive examples of this technique as well as the other links for different examples. I'm sorry that the pictures don't display as they used to but I think Peter is working on that. Just click on the picture links within the threads and they display normally.