I came up with a few that I'm pretty sure haven't been done that I would like to see. As others have said, there is a staggering number of potential combinations (thanks OWAL for the sample calculation - yikes!), so I think the trick is using your knowledge of what goes well together to try and come up with ones that are worth doing, or ones that will help you achieve a personal breeding goal.

I like the idea of using axanthic to try and clean up the super cinny into adulthood, although since a lot of axanthics brown out as well, I think you'd be best off starting with black pastels, not cinnies (since cinnies seem to have a lot more color to them) and a line of really silver axanthics ...