Well Jeff, I'm afraid I'm going to use your comment against you. Un pure breeds like cats should be the biggest reason NOT to cross snakes. There are too many people that think it's "cool" to come up with something like the sphinx cats. A hairless cat, there's a usefull animal. They just do it because they can.
Cross breeding can give you some very unexpected results, most of them are just not good. What if one of these crosses escapes? Ever hear of killer bees?
Yes, it's tempting to make your own critter, but there are just too many down sides .. and I like them just the way they are thanks.