You could take metal sheet and cut up (shears or with a jewelry saw) strips. Or you could do it the easy way and flatten a really thick piece of wire.  Margot Potter (Madge) of DIYDoyenne  shared a great tutorial on the Impressart blog on how to make long earrings by hammering 12G wire into submission! She also stamped numbers onto the strips.  (Update : Picture only, link no longer available).

You really ought to see the brass hammer used!  Now that is the way to get some weight behind the blows.  Great way to take out the day's frustrations and get a piece of jewelry made at the same time!

Before You Go:
Original Post by THE BEADING GEM
Jewelry Making Tips - Jewelry Business Tips