I just did one...I used a piece of plywood that was in the garage..I sprayed it with sealant but am going to put some of the outdoor Modge Podge on it to test and see how it holds up. I used 3 coats of acrylic paint. Its really pretty and I was looking at it yesterday and thinking If I used a richer darker blue & red I'd hang that baby up in the living room. Now THAT's an idea. =)