I saw this idea online to write good things that happen in your life on little strips of paper and put them in a jar. Then on New Year's Eve, you open the jar and review all the wonderful things that happened that year. I love this idea!
I think it could easily be adapted for the classroom. Funny, happy, or special memories could be placed in the jar and read aloud on the last days of school. I think I am going to give the idea a try this year.