Well, I know that the WW games aren't what this forum is about, and I know that there has already been published material about WW / Kult crossovers, but none the less...
I was just flipping through Mage and thinking how cool it would be to run a Mage game w/a Kult backdrop. It would be certainly rewarding for my group since they are all old WW guys that would probably find the change stimulating, especially since they wouldn't know. They'd just think that they were in the Gothic-Punk milieu, not knowing the real horrors that lurked behind it all. The umbra and all that would be a little different, but you could get away w/it I think. Also, it's SOOOO cool how Paradox works, since the backlashes could all be physical mutations from breaking through the illusion. Paradox and Quintessence can work as a sort of Mental Balance for the characters... tho mental balance would have to be more or less discarded, or kept in secret record by the guy running the game. Just some thoughts.