since in various thread people start wondering about converting or finding proxies to use for "series 2" or custom figures, I've thought about creating a thread where gather all suggestions and ideas.
here are some of my finds (all are prepainted plastics):
D&D Miniatures Flesh Golems can be used for varius Dark Legion units:
Star Wars Miniatures Dark Trooper Phase 3 has a somewhat Bauhaus-like look:
HeroScape Major Q10 could be great as Cybertronic unit:
I have a couple of them, maybe later I'll get some pic of them side to side with MC miniatures, to give a better idea of the scale...