Bring a reusable, stainless steel coffee thermos to your regular barista the next time you fill-up on a skim latte with an extra shot. Some stores will even give you a discount for bringing the thermos. Added bonus? Your hot drink stays hot longer and since most coffee mugs are designed to be spill-proof, you won't splatter that mocha latte all over your shirt.
An idea: store hot macaroni and cheese in a thermos to enjoy a warm lunch at work.