There's a great one near my house (near-ish, anyway) that's an old ammo box. Very sturdy, lots of space inside, and nicely waterproof! Takes some hiding, though...
Have you seen a sliding puzzle? I bet you have. I wondered if one could be put on the top of a box for a geocache, then either the picture it makes is needed for solving something or maybe there's contacts underneath each tile that when correct, makes a circuit?
I have never seen one of those but I'm very curious to find out what that is...I'm trying to put all new unique caches out but my artistic ability lacks in that department lol
