At the moment I'm thinking silver and black metal, perhaps with a kind of bronzed or gold base. The only issue that I'm not quite sure how to resolve is how to get a black material with a high amount of reflections. The reflection colour obviously affects the intensity so creating a black reflective colour would lead to a low reflection value. It's only a minor concern at the moment but I'll upload some render tests as and when. . . .
I'm still using my lunch break (or sometimes evening break) to keep up my Project 365, a photo a day for the year. You can find it here http://www.flickr.com/photos/patrickfinnvfx/sets/72157632405931004/. It's been a bit of a mash of a few things so far and that initial well of inspiration is starting to empty. You kind of assume you're going to have loads of ideas but loads at the start means about ten. I'm sure different themes will present themselves throughout the year but it's certainly looking like a challenge. If anyone has any ideas or advice let me know!