Dungeon Dice Randomizer;
3 types: simple rounded corners, sharp corners and stone textured (sides are not perfectly aligned); print all the same or mix and match to designate other features.
Pick up a pair and let fate decide what path is created next for your daring adventurers.
Will it be a blind corner, dead end or greater hall with untold treasures...
6 sides correspond to generic straight away, corner, large room, dead end, t-section or 4-way or change it up and assign them to your own traps and pitfalls... it's not quite as fancy as a DungeonMorph Dice Adventurer Set but it'll do in a pinch.