Mysterious Stranger wrote:
I really like what you have started here. I was looking at the pictures wondering how you made the black rock sides and then read the foam part and realized how genius that is. If you elaborate on the foam building process I'd be very tempted to try something similar on my own.
It is really super, super easy
1) Go to Lowes/Home Depot and get a big sheet of insulation foam from the building supply section (I got a giant sheet so big I had to break it in half in the parking lot to get it in my car for $8)
2) Get a vague idea of the shape you want to build. Start using a craft saw to cut layers out in that shape. Don't worry about being exact, in fact, try to avoid making too crisp of cuts (try making shallow cuts with an Xacto and then breaking on the slices to make a good, rough edge which looks great for a rock face).
3) Hot glue your layers together
4) Cover the foam in some form of plaster. I used cheap patching plaster (about $4 for a bucket), some people use plaster bandages, some people get really really fancy and use bondo and fiberglass. All you really need to do is make sure all of the foam is covered, due to the next step.
5) Spray paint. If you don't cover the foam, spray paint DOES dissolve this stuff.