one of my sell points is the all natural finishes that age gracefully. Some manufactures will even verdi them or antique rust new lights for you. I think all it takes is a little sandblast job. If you dont like the splotches I would suggest using a soloution to age them. Saltwater and vinegar works well. I always make it a point to show clients photos or a real live version of what the fixture will look like in time. In our experience clients dont like the bright copper or bright bronze and definatly not the bright brass.