When I made mine we used many a layers. Of course the design, as fancy as desired to showcase your artistic talents, then batting plus a layer of a thick stiff pellon I think it's call something like "timtuck") and muslin with the postcard logo printed on it. Usually we did a satin stitch around the edges. Those with beads were hand canceled and put inside a cellophane sleeve, but they were mailed for regular postcard postage.