Carapace

In a fit of waning Google+ generosity, Goblin's Henchman sent me a copy of his zine-size adventure Carapace, available for free on drivethrurpg.

Carapace is an interesting product. The adventure (geared toward AD&D but usuable with any flavor), involving a giant ant-hill near a isolated town has no keyed locations. There is a brief bit of setup, covering not only the situation but what various parties in the community might want done, and what the consequences of the adventure might be. After that, there's section of on not one, but three different methods of procedurally generating the maze of tunnels and rooms in the colony: Pointcrawl, Labyrinth Move, and Hex-Flower. Read the Henchman's brief explanation of them here. Finally, there's a section on random encounters and random "dungeon dressing."

If you really dig new procedural approaches and procedural generation in general, this will definitely be your thing. Even if you are like me and this isn't generally your thing, the alien structure of an ant hill seems to me exactly the place where something like this might be useful. Not only would I run this, I may steal some of its techniques for use in other environments.