For a birthday party have the guests write a memory for the birthday girl. We could just have a secret box in the house or...better, yet, we could email them to a volunteer who will print them and slide them into clear pages in a 3 ring binder or better, a scrapbook from a craft store could be used and glue the printed pages in, in some artsy manner. Maybe like we did for Grandpa.
The family blessing jar tradition is a precious way to instill gratitude in your children with the simple act of recording blessings throughout the year. Children of all ages will enjoy this memory building exercise.
The idea is to fill the jar with little notes which will lift the spirits of the reader, or make them smile. But don't let that restrict you! You could print tiny pictures of yourself or your kids. You could write out knock-knock jokes. You could cut the comics from your Sunday paper and use those. Whatever makes you HAPPY.