My players haven't yet adventured the place, but the Judges Guild's Citadel of Fire looks promising. The statblocks might be excessive in the d20 remake, but in my opinion it is an overall improvement of the original.
hey, I love LOVE the cartoons from the 1e DMG and would be delighted to draw some light-hearted illustrations in that old-school, fun-loving spirit! Here's two pictures I've done; of course the illustrations you have in mind would be much goofier :P
I've got more pics here...