If you have a project that needs some cooling you might want to look into using a Peltier Module. RimstarOrg found one in an old water cooler, with a bit of disassemble he found a system that consisted of a 12 volt transformer which feeds a small board which coverts it to 12 volts DC that the module needs and finally there is a small circuit which measures that actual water temperature to switch off cooling power when the water is cold enough. By disabling the temperature sensor he was easily able to freeze some water on the module in no time. You can see the full details of the experiment here.