Wolfshanze,
One thing that I like to do every now and again is this combination: Representation + Caste System + Mercantism + Pacifism. This combination makes for wonderful Great Person farming. It works especially well on a Pangea or Inland Sea map in conjunction with the Statue of Liberty (+1 free specialist) for a grand total of 2 free specialists per city, and an unlimited amount of merchants, easily funding a mighty empire with just the free specialists alone without neglecting your science needs.
Each turn your specialist is producing great person points makes it more likely that you will get a specific great person. Often times I'll end up with far too many great prophets, and far too many wonders produce great prophet points. To offset this, I'll take another city and literally starve a great person out of it by forcing all of their workers to work as whichever great person I want. This can be useful if you need a specific great person (Great Merchant for Sid's Sushi, or a Great Artist to win the game, etc.) Remember that each time you build a great person in that city, the points needed to get to another great person are greatly increased, and some cities have their great person points saturated with far too many great prophet points to be worth trying to force anything else out of there.
It is also fun to play a game with OCC variant, but build only one production city (your main city) and build every other city as a GP city, and focus on Great Merchants. Put all of your great merchants into your capital, and see how high of a population you can get! I've ended up with a population 40 capital that had very few flood plains, and I'm sure others could get higher under more ideal conditions.
The game doesn't always have to be about winning, sometimes it's fun to just sit back and do something goofy while having a good time.