Albino Spotnose has been done. Morton Wright produced four of them in 2009 and had some in Daytona last year. I didn't bring my camera with me though.
Also, I do believe that someone has calculated the posible crosses before based on the amount of base morphs. With that said, there are probably somewhere around 500,000 crosses at least that have not been done. Therefore, I think this would be a very long list.