When I was a child Mom made an advent calendar (which I still have) out of felt. It had a Christmas Tree on the top and 25 pockets on the bottom. In the pockets were shapes cut our of felt that looked like Christmas Tree ornaments, and in fact, each day we were supposed to hang one ornament on the tree on the top of the calendar. Among the ornaments would be candy canes, candles, reindeer, a star, an angel, a teddy bear, a Christmas present, a dove, a mitten, a little manger, and a Santa Clause. It was a lot of fun and built up the excitement for us as kids. I don’t remember if we said special prayers for each ornament or if there were any special criteria for who got to take the ornaments out of the pockets and put them on the tree, but a simple ritual would be easy to come up with.