I truly believe that most teachers feel under-appreciated. But just some little thing can make all the difference.
I remember one year when the students put a gift in each teacher's mailbox each day for the entire week. The gifts weren't much. One day was a pencil, one day a pad of post-it notes, a apple, a cupcake paper filled with little candies. It wasn't the quality of the gift, but the fact that the students had taken the time to do just that little extra something for their teachers. It made all the difference in the world.