Oh man, that'd be funny. Have a "museum" from the point of view of the bad guys; for example, one exhibit would be a 10x10 room with a lone Orc (illusionary) guarding a chest, with a little plaque outside commemorating the valiant death of Kurg the Magnificent at the hands of an evil party of surfacedwellers (a Cleric, a Wizard, a Fighter, and a Rogue). I'm sure someone could come up with more cliches to use.