Nomic

This is something really cool that people should take a look at...

http://en.wikipedia.org/wiki/Nomic

Basically, you start out with a default set of rules and the game involves making changes to the rules and proposing new rules. It is really interesting how different things happen in different games, as people learn from previous games. I've contemplated using the Nomic style of rules for multiple things, including sports simulation leagues, household rules, homeowner associations, and local governments.