I used carved styrofoam insulation board as is pretty common now. The only thing I think make mine stand out from some that I've seen on other sites is that I didn't want them to look too new. I wanted the look of old, cracked and pitted. Like they had been forgotten in a run-down cemetery for ages. The painting was done in stages - a medium base coat followed by two coats, one light and one dark, applied with a sea sponge.
Home Depot - Foil sound barrier styrofoam panels............................... styrofoam insulation with sound barrier foil on them. They are 4' wide by 8' tall, weigh about 3 pounds each, and are only $10.00 a panel.
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