When my friend originally made these, she used one larger garbage bag and stuffed it with plastic bags from grocery store checkout to make the head. You can do that if your grocery store uses white bags. Some of our stores here use blue or tan bags, which would show through. If you do use grocery store bags, you're going to want to make sure that when you're balling them up, the letters are inside. If not, they'll show through behind the ghost face.