Stamped concrete flooring is suitable for a mudroom or bathroom. Polished concrete is a really great flooring solution in large, open spaces. With a scattering of rugs, this would be good in a loft. Also looks great in a basement if it's done well.
Original suggestion is "nail polish + recycled lightbulbs for garden art." I think they'd make cute Christmas ornaments, and there has to be better paint and glazes than nail polish, with its tiny brushes.