Dungeon Morph: make an infinite role-playing dungeon with dice

Each face of a Dungeon Morph die features an interlinking section of dungeons, caves, wilderness or medieval city: simply push a set of five together and remove and re-roll as needed to create a never-ending map for your adventures.

DungeonMorph Dice Adventurer Set [Amazon link; see also the other sets]

They also come in the form of a square deck of 90 double-sided cards.

There's something about this sort of thing that throws a hook into my brain and reels me in.