S.S.
I teach second grade and my students go nuts when someone brings erasers, stickers, pencils, etc. Kudos to you for not wanting to send in just candy.
A few years back I had a mom bring in mini cups of hot chocolate for everyone. She made it in the teachers lounge. Teh kids were able to add 2 marshmellows. They loved it and it was a nice 10 minute break for me that they students were occupied!