[derelict]

I thought about something similar. making a res that has a maze like shelf system so water is forced to trickle through the res. Shelves could be metal as well as outside case for a bit more cooling.

For aesthetics only I thought it be funny to have a similar design but put blue oil in the res, like those old paper-weights that you flip upside down and the oil makes its way to the bottom. Obviously you don't want it getting out of the res, but there are ways to use some of that mech energy from the water to stir up the oil a bit.

At the end of the day though I really don't have any interest in "candy" modding of cases, I prefer performance to being pretty.