I've done it somewhat successfully using two water loops. I never got the time to see it through to sticking it onto a real system since though.
Just had a single 172W 40x40mm pelt driven at 12V from a regular ATX PSU, sandwiched at high pressure between two micro-channel blocks. One cooling loop cooled the hot side of the peltier, and the other side just had water looping through it.
I esimated that around 100W of cooling power was being applied to the water, but this drops off as the water gets colder, as peltiers lose efficiency the greater the difference between the hot and cold sides.
It managed to freeze 3 litres of water solid in a little under two hours. The temperature rapidly dropped for the first 10C below room temperature, but after that it slows down fairly quickly.
Driving the peltier at 12V was a bit of an issue. Really it should've been driven with at least 16V to get good performance out of the single peltier, which is nominally rated for a 24.6V peak.
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