I have a ghost kitty. (screencap not mine, I stole it from Wowhead)
![](http://img19.imageshack.us/img19/1109/128140.th.jpg)
I didn't even know he existed, let alone was looking for him. I just stumbled upon him while questing, saw that he was tameable, quickly ran to stable the pet I was using and ran back to tame him. The whole thing took less than a minute.
He's not as good as the cat that I normally use (although he is two levels lower so we'll see when I get him up), but he certainly is pretty.