Our party has a halfling paladin. He helped to negotiate a larger payment for saving a town from orcs, not because he was greedy, but because he had a wife and seven kids to support. That's right, a salaryman halfling paladin. We also have:
A healer trained by an order of pacifists, who comes from a millitary family, and so has no problems with killing. Oh, and he worships all the gods, even the contradictory ones, all equally and all at the same time. NG because he generaly wants to help people, and the god thing is more out of respect than actuall fervrent worship.
An elven ranger who favors goblins and the longbow style. She is also a lesbian and enjoys stirring up trouble in an impish manner. She also is racist against humans, seeing them as oportunistic, greedy, and racist.
A halfling rouge who's on the run from her old thieves guild because she did some double dealing with stolen goods under the table without giving the guild its cut. See tried to stir up a conflict between a dwarven mining company and the towns government so that she could rob the mayor blind and blame it on the dwarves.
As the DM, I filled my world with cliche on purpose just to see what happens when I let these guys lose on it. When you have to say 'Ok, you used up your free action for talking' when your healer is trying to have a phylosophical discussion with your evil masked spellcaster ridding a flying monster, you know things have gone crazy. Naturaly, I have plenty of origional points in there too. Such as the dragon the town is scared of and has only seen in the distance is actually only a draggone. The PCs have viewed it off in the distance twice, but rolled low enough that they drew the conclusion themselves that it is a dragon. I never stated that is was, it only had shiny scales, was large, and had batlike wings and a long tail.
When you throw in the odd piece, disguise it so that they think it's a cliche at first. Dragon filling a town with fear that it will eventually attack? *yawn* Wait, it's not a dragon but a rarely used monster that the town mistook for a dragon? How will that play out?