The phrase "making blood run cold" is used to describe something that is eerie, scary, and unsettling. However, there are antonyms for this phrase that refer to things that make us feel warm, comfortable, and safe. For instance, comforting, soothing, and reassuring are antonyms of "making blood run cold". When something is reassuring, it can calm our nerves and make us feel better. It can be a hug from a loved one, a kind word from a friend, or a peaceful atmosphere. So, instead of dwelling on the scary and the dreadful, let's focus on the positive and reassuring things that make us feel warm inside.