What if you combined the games Settlers of Catan and Pit? I'm thinking through how this would work. You'd start the game like any Settlers game, but when it came time for your turn it would get interesting. Instead of saying "two sheep for a brick!" you'd just say "2 2 2 2 2 2 2 2" or maybe "2 for 1, 2 for 1, 2 for 1" or something like that. I'm thinking players can only trade with the person whose turn it is (like in the regular game, you can only trade with the person whose turn it is). The turn would end when you end the bidding, build your stuff, and hand the dice to the next player. You could get in the situation where the one player is like "1 1 1 1 1 1 1 1 1 1 1" and everyone says "we don't have one to trade!!!!!" and it would be just like regular Catan.
Someone needs to try this and report back.