I assume you mean what they refer to as the Penn Ohio walls. If they're dense foam, I've worked with something very similar (portals) from Scenic Express and they're very easy to work with, easy to cut if necessary, and easy to paint (if you don't like the original color) and weather with chalks and/or acrylics. If you add grasses, vines, etc. and other greenery, they look very realistic. Depending on how many you need, not inexpensive, though. Hope this helps.