Use pennies for enameling - cheaper and sturdier than most round copper discs! Great size for jewelry. (these are so pretty. not that I will be hand-firing enameled pennies anytime soon!) Perhaps nail polish?
Great idea for making easy "enamel" headpins from either manufactured headpins or your own sterling silver wire. If you can find balled end plated headpins I see no reason you couldn't use those to dip the ball end into. No torch required that way!
SOCOFY Large Size Floral Print Soft Flat Leather Loafers