if you are still looking for an idea for your "creepy green" i might have the ticket. if you can get your hands on some of that transparent green acrylic you could put the cathode behind that. if it's dark enough it might subdue the light just right. if you changed your mind or already figured it out then sorry for the wasted time.
naah, good idea, Unfortunately we started moving house a while back and the mod was in the garage, so enevitably it got crushed, not once but twice while i was out. I got back and it was all scrateched and the bondo was all cracked. I am starting again, but not untill i am back at uni. Away from parents.