Zeropluszero from Australia put up a guide on how to insulate a motherboard for subzero overclocking. Subzero overclocking refers to using copper pots or containers attached to CPU or memory or graphics cards and pouring liquid nitrogen or dry ice inside the container to cool the CPU/memory/GPU. Once you cool down the copper container, moisture in the air condensates and creates ice or water puddles depending on how humid your place of benching is. This means that the hardware requires some protection to ensure it does not short circuit and die.
Here are a couple of shots from the guide but for the real McCoy, jump over to HWBOT forum!