Another quick, weird idea, inspired by a recent discussion: what if we took away class powers? Instead of defining classes by what they can do (leading to ever-increasing numbers of classes and a general power creep,) why not let anyone do anything? Fight, turn undead, cast spells, pick locks... plus oother talents PCs could pick up at any time, through training and spending cash.
But still have classes. Instead of classes by what powers they have, define them by what they *can't* do. Each character must take at least one class.
Classes would be something like Atheist (can't call for divine aid,) Jinx (fumbles spells and attracts trouble,) Coward (poor fighter,) and Clutz (bad with traps and stealth.) Maybe there would be other classes that PCs could transition to if they wanted to get rid of an old class, like an Atheist who wanted to become a believer could become a Cultist or Divine Minion through role-playing, take some other drawback to get rid of the ban on divine aid.
What other classes would exist?