Torch firing is interesting and very easy–I took a class in it from
Deb Lozier a couple of years ago.
If you have some scrap copper sheet and some jewelry enamel handy,
give it a try! Just sprinkle some enamel on the copper and heat from
the back side until the enamel melts. Interestingly, the metal need
not even be clean. Black copper oxides on the surface will be
reduced to an attractive red patina, visible through clear or
transparent enamels. It does take a lot of practice to get the
effect you want.