My family started a new tradition this year with the Thankful Jar.
We asked everyone coming to Thanksgiving to bring a small item that could fit in a jar to represent something they did or something that happened this year that they were thankful for. The item didn't have to represent something big and meaningful, just anything that came to mind. Some items were light-hearted or funny and some represented more life-changing moments. In addition to the objects, we each wrote a sentence or two on a slip of paper, dated and signed it, and added it to the jar. Next Thanksgiving, we'll open the jar and count our blessings again.
You can find more details about this project and how my family will use this jar on my blog: http://writesnapscrap.blogspot.com/