i've just received my official case that might be worth checking out. i really like it even if a bit expensive.
i've got a silver 6p and went with the silver case, and would recommend going for a black case instead, just because from the front the phone you only see the black around the screen and it looks better black on black rather than silver case on black.
I had thought the silver case with the silver phone would look better, but the only thing you see of the phone that's silver is the finger print reader, but you get the black bar from the camera so the camera black stands out just as much with a silver case than a black case showing the silver finger print reader.