If using my 14 year old design talents, my dungeons would have more rooms that had pits filled to floor level with gooey eyeballs...
..and "magic speaking fountains" that actually contained water weirds...
...and at least three artifacts, all of which would cause some terrible curse, like sex changes, alignment changes, and acne...
...and at least one lich, one vampire, one dragon, and one beholder on the bottom level all guarding a...
Deck of Many Things.
Good Times.