Yeah, I have a couple of sets, too (the sports balls and the gazebos), but the d20 is uniquely difficult to design for, as there's no flexibility whatsoever in the symmetry. It's still workable when you're just using abstract patterns, as many dice do, but making the die itself shaped like something is much harder without playing around with the symmetry (hence why so few of my d6s are cubes). Part of the reason I made the sports set is because a soccer ball is one of the few objects that does have the same symmetry as a d20.
danielbambeck@ifreedman Actually, a bit unusually for my dice, the envelope of this one is a cube (most of them have one diagonal shorter than the others, while leaving the faces identical). The two stems form two of the corners, while the corners of the leaves form the others.
I find that it's easy enough to read in red, but I haven't tried it in green yet myself. A fine-tip permanent marker might help with that, or possibly paint that's wiped off of the outer surfaces before it dries.
As an aside, what led you to find my dice? I've been trying to figure out how to get the word out more.