Midnight Blue on Space Grey. I was resistant to the idea of a full case, when I used to only use the Smart Cover on the iPad 4 in order not to bulk it up. But the Air 2 is so thin I'd feel like I'd be worried what I put it down on and certainly would want it in a case when carrying it in my laptop bag. So far I'm loving the case, but sometimes I take it out to use when I'm home to enjoy the full effect of it's light profile.
Might end up getting a smart cover as well for home use and keep the case for when I'm on the go. Kinda have my eye on that white Smart Cover.. pretty slick looking.