You could do gingerbread cookies. Cut them out with a drinking glass, then cut a hole from the center with a shot glass. Or you could cut bagels in half and put almond butter on them. Make egg salad or cheese sandwiches on whole wheat bread, then cut them out like I described for the cookies. Or, how about slicing eggs and gluing the slices to pieces of bread with mayo? The egg slices themselves would be the zeros. How about carrot slices with a little salad dressing for dipping?