nope no clue yet how to turn the metal green. i can nickel plate and copper plate and gold plate things though. I'm not sure yet how coloring metal works. I'll look into it for the future... you never know when some skill or some piece of knowledge will come in handy in the future. I've blackened steel before, but not green
i've ordered parts in every material they offer, plus i've used printers at other companies. stainless steel from shapeways is by far my most favorite material for making things. the other materials feel too light and cheap to do anything useful with it. they're fine for display, but =/ i wont wear a 100% plastic ring
you can dye colors yourself if you pick the wsf option