Oh, gift giving at Christmas is such a wonderful tradition! There are many wonderful gifts you could choose to give your boss, depending on your relationship and their interests. If you know they have a favorite hobby or activity, you could get them something related to that. If you want to keep it more professional, you could get them a nice pen or a gift card to their favorite store. Or, if you want to really show your appreciation, you could get them a personalized gift like a nice mug or photo frame. Whatever you choose, I'm sure they'll appreciate your thoughtfulness.