Art museums are getting all experiential these days, and the Denver Art Museum's Open for Design challenge and exhibit proved just how good that can get. Last summer, regular folks — artists, designers, doers, thinkers, nobodies and somebodies alike — took over the walls of the DAM's Hamilton Building to show off artful models expressing their ideas on how to make the world a better place. The ingenuity of the concept bled right through to the entries themselves, which included a hanging lamp crafted from plastic spoons in alternating colors; numerous garden ornaments, poo-bag dispensers and other whimsical objects utilizing junk and found objects; and a real-estate brochure box recycled into a streetside "poem box." People have good ideas; thank the DAM for letting us see some of them at work.