For years I've been stabbing small branches through Styrofoam meat trays to hold up Munny, Dunny, and Android parts while I hit them with coats of spray paint. As you can imagine, this isn't the most ideal set-up, but there aren't that many other options - chopsticks stuck into a heavy blob of clay being one of them. But today I stumbled across Mr. Paint Station. This is basically a stack of corrugated cardboard shipping boxes, but the holes are a bit smaller, making it easy to securely stick toothpicks and chopsticks in there. I'm not sure if they'll stand up to a blast of aerosol, but I might as well give it a try. If you're into customizing, you might want to check it out too. Coming from Japan, they aren't very common over here, but I have found one hobby shop - Sprue Brothers Models - that stocks them. You get four Mr. Paint Stations for $12.

See more customs here