The Lingvistov brand of illustration (previously at Neatorama) evolved from the founding of an unusual, Skype-based English language school by two Russian linguistics teachers named Asia and Landysh. They not only sell their illustrations in various forms via their online store, but they use the "doodles" (as they refer to them) as resources as well.
Here they have illustrated twelve types of cats. See all twelve feline varieties at this user-submitted post at Bored Panda (a couple are named with mildly NSFW language).