> Guesses: a mini rex or silver mix?
I'm not sure I see much if any mini-rex - Rex fur is unmistakable, standing up just like velvet, with the guard hairs and undercoat the same length. Rex fur is very soft and smooth, not coarse.
It's a little hard to tell from the photos, but the fur on your bunny seems to be of the more conventional sort, with a plush undercoat and longer guard hairs. Whiskers are usually another giveaway - Rex rabbits have curly and kinked whiskers, rather than the long straight whiskers other rabbits have (I can't see the whiskers in those photographs).
It is exceedingly unlikely that there's any Silver in the mix, if you meant the breed "Silver". Silver rabbits are very rare, and they don't look anything like your bunny - see
http://www.rabbitsonline.net/showthread.php?t=77886
To me, the fur color on your rabbit looks kind of like a grey variant on one of the otter or marten colors, or maybe a greyish agouti color - darker on the back and white under the chin and underside. Or, maybe it's one of the chinchilla colors or even a mix with
Chinchilla breed? I'll leave that to the breeders on our board, who are much more knowledgable about colors and breeds than I am.
We have a "what breed is my bunny?" identification key you might try working through.
Click here to go to the start of the key, then just answer the questions and see where it leads.