I don't think anyone has attempted a Mojave clown to my knowledge. The current combos out there are:
1. Lesser Clown
2. Caramel Albino Clown
3. Albino Clown
4. Pastel Clown
5. Killer Clown

I also know of people working on Pewter clown, Spider clown, Enchi clown and Butter clown.

I am sure there are many other clown combos out there that we are yet to see!