If you like to get down with re-purposing junk in the name of art, apply at myfountainsquare.com. Works should be big (10x10-foot limit), sturdy and weather-proof. The structures are not permitted to use water or electricity, but, as the official guidelines tease, "solar power is a different story." The only outside materials allowed are fasteners and supports.
Past EcoSculpt works include a forest scene made solely of aluminum cans, a recycled shopping bag structure and a model of Cincinnati's three largest skyscrapers made of used computer pieces (pictured, above).