Dozens of barns around here have them. I guess it's the latest fad. Two people I know painted their own on pieces of plywood. One is a whole quilt painted across 2 4 x 8 sheets of plywood. The other is just one quilt block painted on a smaller piece. They look very pretty mounted on the side of the barn.
I suppose that would only work for old wooden barns. Most hubbies would probably freak if you tried to mount a board to the side of a nice metal machine shed.