I've been playing on my Blue 3DS XL! It came with Mario Kart 7.
Strangely enough, I never really played it that much... I just don't like Mario Kart single player. Go figure.
I also happen to have my old Japanese Ice White 3DS, but it's the one who caused my ACNL town to crash often. I'm not sure what to do with it anymore, but I might sell it at some point in the future.
I had a blue 3ds but it broke and I upgraded to a black 3DS XL... I wanted pink but store didn't have it in stock and I didnt really wanted to wait for it to come in the mail.