I got a green one because gray seemed boring and orange dull. Pink was too bright, and eventually I decided on green over blue. I won't mention the leather ones because I'm a vegetarian, those weren't even an option for me.
I now have the black leather and the green smart cover. I had used the Belkin clear snap cover but it has cracked at a few edges. I have a Zerochroma back cover on the way in the mail. I can't wait to get it on my black ipad
but UPS has added some Holiday time to my 5 day delivery time.
I have a black xgear back cover and I rotate between a pink, lime green and baby blue smart cover. I also own a baby pink roocase folio cover that I also use. My white iPad is always looking cute
I do have the clear plastic back cover that works with a black leather Smart Cover. Really sleek. Many people can't tell I have a back cover on at all.