I like the green for my black 4S but I'm gonna have to see a review of some kind before I ship over any money for it.
Orange would look really good on the black I think.
Picked up a Charcoal Gray for under $20 with next day shipping
Def the best TPU case on the market IMO
It's slim, feels good in the hand, all the buttons have outstanding tactile feedback, and gives a nice lay on table design.
SGP has done it again...def recommended
Here are a few pics