Are you doing this out of your house? what about pretzel rods dipped in chocolate, mini choc chips for eyes then top with a gummy lifesaver for a hat.
Chex mix seems to do good what about tea breads? cupcakes? brownies? carmel corn? fudge? I would be careful if you use poultry or met if you are having them at room temp. I'm not sure how you are setting it up and you dont want any getting sick if temp isnt correct.