This is basically the same concept as the Ear Cuff created by Chelsey (thank you for the inspiration!), only it's for your arm instead of your ear. I used leftover garden wire from my chandelier project (Garden wire is about 12 gauge).
Cut about 1 1/2 feet of garden wire, and bend it in the same zig-zag fashion as Chelsey's instructions.
Curve/curl the two ends into shapes.
Curl the wire around something as thick as your arm. I used a vacuum cleaning tube. :P
Slip onto your arm and mold it to your shape. If the two ends overlap, I just bent one end back to make a latch.