Remotely related to something I was wondering yesterday: outside of 'house rules'-type variations, are there major changes to common games that are viable, popular and catalogued somewhere? e.g., add a few pieces and turn Monopoly into a zombie horde game, or change Scrabble into a dungeon crawler or Uno into a space RPG.
More like repurposing games to play other existing games rather than the overhaul you're talking about.