One of the conversations at ‘art camp’ centered on Etched Copper Jewelry. I could not find a site that focused on the jewelry and not the process. So, the link will take you to the Google images for etched copper jewelry.
Art camp was wonderful. My head is spinning with new techniques and ideas. And…I made enough money to purchase the supplies I need to etch copper…HOORAY!!!
Ornamental Elements 
try etching w/ saltwater{1/4 ratio} and electricity