You should be the first to try a open liquid cooling system. Just hook up the cold faucet of your sink to the side of the computer and there you go. Or mount a bag of ice inside.
This might be an interesting CASE MOD. How about building a OCin' machine inside a storage freezer? LIKE THIS:
You would have to take all the necessary precautions like incasing the components in plexiglass or whatever works. You'd just have to make sure that condensation would collect on components. Then crank up the freezer to like 10 to 20F and overclock away....
It probably wouldn't work, but it could be fun to try... lol