Stamp a message on it, or glue on a picture. Use as a base for epoxy clay. Scribed design around the edges. Two loops, so you can hang it vertically or horizontally - just cut the other loop off with wire cutters and smooth the edge with a file. Or come up with some innovative design that captializes on their being two loops at 90 degrees. Lead, nickel and cadmium free.
15mm x 21mm By the each.