Just found this lovely dungeon over at the most interesting blog, Monster Brains. The cover to the book 'The Troll Book', by that Berenstain guy, 1980. Doesn't it just call out to the marauding Player Character in us all?
While you're at it, I suggest taking a gander at other posts over there. Lots of great illustrations and paintings from way back when, across multiple genres, that'll most likely prove inspiring for any manner of game or setting. If nothing else, it might be entertaining.