Thanks Hal, I made all the walls. The concrete retaining wall under the mountian is made of 1/8 inch masonite because I had no room to spare for the siding that travels under it....
The block retaining walls are scribed on Polystyrene pink insulation.... I scribe them with a really sharp lead pencil, then emboss them with a couple of pieces of rough broken granite stones, then paint them. It hard to see in the photo, but I built a long retaining wall under the backdrop with the trees, it's about 5 inches tall, 7 feet long.... I made that one out of pink styrene insulation also... If I have the room (depth) I prefer to make them out of styrene. I cut the styrene on a table saw and I use a 7 1/4 inch blade instead of a 10 inch blade because it creates about 50% of the dust as the blade kerf is really thin. Honestly, I started making them because I needed so many linear feet, would have cost me a small fortune to buy the precast wall sections..
