In a model railroading project many years ago, I created trees using floral wire armatures covered in latex caulk. I created armatures out of wire, covering it with Brown Sculpey clay. After I was finished with this annoying step, my daughter pointed out that there was no need to use the wire. Sculpey, once baked, is quite durable.
For my first two camps, I decided to go with some basic designs that would work for multiple armies, creating a tent scene and a rock wall.
The rock wall also involved Sculpey, gray clay this time around. I created the wall out of the clay, glued it to the base, and pressed rocks into it before baking. I finished up with a simple ink wash.
Here's a shot with a Spear element defending the camp.
The tent scene took a bit more work, but it was also an easy project. I built the tent frame out of floral wire and super-glued canvas to it. I coated the canvas in diluted white glue and painted the tent a gray color.
Peltasts (Aux) are defending the camp.
I've also made some "rough" terrain pieces and hills, so I will be able to upgrade from the felt squares look soon.
Regards from Maryland,