I love copper and love working with it, so this techinque might be something to look into for the future. Here is an example of a flame-painted pin.
Flame painting involves a using a torch to heat the copper. Different degrees of heat make different colors. I can just imagine making a pendant using this technique. Isn't it beautiful???? This heart was made by a husband and wife team. You can find them at www.coppercolorists.com