I have had this vague idea for a world's first Boa mutation for awhile now, but i'm not sure which gene combinations might be able to accomplish such a thing. As far as the patterns go, I have seen many Motleys with circular shaped patterns down their backs, depending on how your eyes perceive the markings.

Here is a pretty good example:



As for how to make those circle patterns black (and, possibly more circular) and the rest of the snake green, I don't have a clue! What do you guys think? If anyone comes up with a way to create such an awesome mutation and produces them, please don't forget you owe me at least one of the hatchlings for the idea! lol