You don't really NEED to bring anything, since I should have everything here (the exception being your own cookie sheets if you don't want to have to wait for your ornaments to bake here), but if someone wants to bring something, here is a list of things that might be helpful:
applesauce cinnamon drinking straws (only a few) yarn or ribbon cookie sheets for use here cookie cutters (I probably have well over 100, but if you have any special ones you want to use, please feel free to bring them) snacks to share beverages (if you want something other than water, hot chocolate, skim milk, or juice) acrylic or fabric paint glitter