I am a recent convert to browsing the inexhaustible font of lists produced by the guy who runs
Elfmaids and Octopi. He may not have completely worked-through mechanics, but his lists are always inspiring if not great to outright steal from. Look for his Redbrick Dungeon Zone section in particular.
Anyway, on topic I did find at his site the
Little Guys list which is dungeon-themed. Someone even statted out his suggestions from that list and put them
here.
Good grief, if nothing else consider just reading
his list of potential things that happen when you camp in a dungeon.