I was thinking a bit ago as I walked around the in game world about puddles. Rain causes them, snow causes them. Our characters have the ability to get wet, to the point where their clothes are soaked through completely. But clothes also dry over time.
It might be interesting if as clothes dry, puddles accumulate on the ground as a result. These puddles would grow larger the longer one remains in a room, and could then be cleaned by someone with a mop and such.