Mezmaron wrote:The grey spray paint made it look cool, but as an added bonus also partially melted it, making it look even better!
If you have a piece on which you don't want the melting effect, there are spray paints with a different accelerant formula that won't damage the foam. There's a Testor's kind, although I don't remember the specifics because I've switched to the much cheaper alternative of floral spray paint. The Design Master brand is usually available in a wide variety of colors at most craft stores like Michael's, Hobby Lobby, Pat Catan's, etc.
And yes, my wife has even had to endure me poaching a big piece of packing styrofoam out of a dumpster we were walking by- dunno what it originally packed, but it's a nice 2'+ long piece that looks like a rampart wall of some fortress.