I like this idea. Start the year with an empty jar and fill it with notes about good things that happen. Then, on New Years Eve, empty it and see what awesome stuff happened that year. Good way to keep things in perspective.
Starting on 1 January 2013 with an empty pot. Throughout the year you can fill it with pot of paper where you write down fine, fun events that are happening. On 31 December the jar may open and allow you to relive your short years. Also nice to work with your family to do