I find it quite interesting when I see a wolf flirting with a coyote, or anything like that. It makes roleplays interesting, especially if the rp is supposed to be very realistic. I have never encountered anyone from another species asking any of my characters to be their mate, but when it does happen, I'll be open-minded and maybe even accept the request. And I like hybrids, and people who create them can do just about any markings, ears, etc without feeling unrealistic. It gets kinda boring when someone creates a spotted hyena, for example, and they almost always stick to the spotted hyena markings.