Glyfair
Explorer
During my blog reading I found this great campaign idea from Robin Laws' blog. He recommends using a non-D&D system admittedly (D&D doesn't do this sort of game well), but it is set in a classic D&D style setting though, and it sounds like it could be a blast!
Idea for RPG series: Gigantic dungeon complex full of treasure found in isolated wilderness. Adventurers travel from all over to plunder it, setting up bustling lawless town. PCs are not adventurers, but the leading figures of the town, who struggle to skim its wealth and harness its nascent political power.
Set in a default D&D world, with all of the attendant world elements that implies. To prevent it from turning into an actual D&D game, uses simple narrative rules set (HeroQuest, Fudge, Over the Edge, etc.) capable of handling political and social conflicts.
Occurs in a world of suddenly murky morality. Old alignment system, which used to be objectively verifiable, has now crumbled. Gods still grant power to clerics but have gone silent. People must now work out a new moral order of their own. Town is ground zero of moral ambiguity.