Snowman Wrapped candy bars - Wrap a full sized chocolate bar with white wrapping paper and draw on the faces. For the earmuffs, use a black pipe cleaner and pom poms. Use buttons or black puffy paint and a cute ribbon and tag to complete the look.
I like the idea of giving students candy treats with cute notes for test days. This helps give them some energy power to do their test, and helps students with test taking anxiety. The positive notes starts the test day off on a good foot.