I started an Etsy shop to see if there are people who want
professionally photo etched copper and brass sheet. They can be cut
with scissors, jeweler's saw, disc cutter, etc., to make your own
pendants, earrings, decorate boxes, greeting cards, etc.
http://www.JewelryMakersSupply.etsy.com

They can be oxidized with liver of sulphur. Copper can also be
oxidized with JAX products. You can also fill in the etched portions
with acrylic, Jaquard powders/paints, mixed with a base, ink, etc.
Laurie Jo