A few weeks ago, I participated in an advent ornament exchange with my LifeGroup friends. We got an advent devotional and an ornament for each of the 24 days (corresponding to the topic). Kate's too young to "get it," but we read the Bible verses and talk about the ornaments as she squirms in my lap. Amazingly, she is able to point to the right ornaments as we ask her about them.
The tree is a small, 4 foot one I had in my classroom one year. You could tell Kate was so excited to have a tree just her size!
I'll try to post more about the ornament exchange soon so that you can have the information if you're interested.