When it gets really cold, any available option that solves the purpose to keep you warm is good enough. Rachael Burns from the UK has knitted her way to keeping herself warm and cozy with Mac's power brick. She knitted herself a snuggie, "Sockintosh", with a pouch for the power block and when the power block gets heated it helps to keep her feet warm.

Do not ignore the warning on her YouTube page, "This was knitted as a joke. Your power adapter should be kept very well ventilated for safety reasons. Don’t set fire to yourself please."

[Dvice]