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.
What a great tradition to start.... Have family put money in mason jar throughout year. At Christmas time, choose someone to bless (anonymously). Our family does this with two other families every year. The kids get to choose the recipients. This brings joy to the receiver and the giver! Must read the book "The Christmas Jar" it explains how it all started.