Great New Year's 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.
Christmas or New Year's gift. Labeled jar and pen. Throughout the year, write down memories that make you smile. On New Year's Eve, open and re-read all of the good stuff that made the year wonderful. Maybe have a 'God Thing' and 'Happy Memories' jars.
Get people to write a date night idea on Popsicle sticks, put on the guest book table. Date Jar - Romantic DIY Gift. Pick a few nights per month and draw a paper with an activity for just the two of you.