Here are some more generic dungeons using the Donjon Random Generator and the quicky desktop method in case you get caught in a spot.
This one is a sort of tomb set up. Assume the PCs start on the lower left...A and B can be some clever features if you have time to think of any. You'll have to think of a reason that the prisoner is still alive...(click to enlarge)
This one is an abandoned castle, floors 2 and 3 respectively (first floor's boring, I assume). Start on the upper left. The void in the center is the castle's central courtyard. Unless you put in some intelligent monsters, assume many of the locked doors are actually just stuck or rusted shut.
This one is a heavily fortified factional dungeon with 3 sides fighting it out--pick who the 3 schemers (in pink) are, and then assume the monsters around them are their minions.
Aaaaand I stuck the basic "lair" dungeon (it can be raiders hiding in a cave system or a nest of criminals or whatever) from yesterday just so they'll all be in one place.
My big OSR Over Dose Loot week
6 hours ago