This is very interesting, and I think for most people here very difficult to achieve. Maths isn't everybody's favorite (not mine at least, so I mainly stick to painted masks - I seldom use random masks, anyway). But I think it would be greatly appreciated by many if you (and other mathematical wizards) could once in while (sticky, perhaps) post some interesting 'find' in this sense. As a small catalog of tgc's to use or study whenever it's effect is usable.
---Dune