hehe actually it's not copper, it's shining gold. I used a very thin wash of tin bitz all over it to darken it and make it look dirty, and painted extra on around the rivets and stuff. I like the green idea, I'll give it a try on the predator I'm about to do
The copper trim looks very cool. Perhaps a bit of green oxidization of the copper would really compliment the used look. I really like this. Did you use paint or copper leaf?