you could always buy some copper coloured spray paint and spray over the fixture... i've done something similar to a fixture for a stage setup only i used bronze.
Copper spray paint, isn't the same, I actually don't mind the patina as the copper ages and it goes darker and gets random little green or blue spots on it, I guess I could actually copper plate the fixture which is pretty simple to do at home with a low voltage DC power supply and some copper, vinegar, and hydrogen peroxide...
Sammy, what are they worth ?