In last year's, I included little slips of paper that had ideas of fun things to do in the summer. I used repositionable adhesive so they could take them out and look at them. Unfortunately, the adhesive didn't last until August. Mom and Dad said around March they started finding little orange slips of paper on the floor that said things like "walk on the beach." Doesn't work very well in Minnesota in March.
This year's calendar -- using up a lot of my little bits of ribbon!