@ 12" x 36" these will fit into a standard poster frame, although they would look much better in a metal sectional frame.
get a set of 12" legs and a set of 36" legs a piece of foamcore and some plexiglas at the glass shop, instant success!
Use 2(two) hook and nails to hang via wire DO NOT use a saw tooth or hang it from the back of the metal top rail of the frame!