When I test a student, especially a young one, I always reward them with stickers. This afternoon I tested a kindergartener and gave him one of my huge badge stickers that says "I did my best!" because he worked really hard for over an hour. That is like eternity for a 6 year old. When I brought him back to his classroom and he walked through the door, there was a collective "wooooooah" from his classmates when they saw his sticker. He then told me he was never taking the sticker off. It was so fricken cute.
Wouldn't it be awesome if stickers still made us feel that special? Ahhh, to be a kid again.