Do you use a paper calendar? A family planner can be a helpful tool in a busy household. When the year ends and a new year is about to begin, why not continue to get some value from it.
There are a couple of ways you could tackle this project. You could get the kids to draw a picture at the end of each month in the current year and at the end of the year you have a record to keep and treasure. Alternatively, this would make a great gift for a grandparent or other family member.