If it were me? Black. It will highlight the copper green and edp - it's always nice ot have a dark neutral background when you have two opposite colors. But then again it depends on whether you are excited by the reactivity of those colors or just the colors themselves. If it's cool reactions you're going for, I echo the suggestion of opal yellow. I wouldn't stick rubino in there with the EDP, though, unless you want to pull your hair out.
