I was fiddling with the broken cobblestones for the floor of a cathedral, and thought to myself, “Huh, that looks like a maze.”
So it is!

Maybe it could be a neat little game of “if you step on the crackled tile you fall into the pit.” Or that classic “hidden walls” puzzle: the players try moving, and the DM won’t let them move onto a cracked tile but won’t tell them that it’s the cracked tile that shows where invisible walls there. (Something like “A wall of force stops you from moving forward.” Eventually they players will realize it’s the cracked tile that shows where the walls are.)

Have fun!