I like the NOEL including the clock. It's the proximity of the mantel to the tree, though, that pulls off the impact. I did it with Red and Black and used a round chalkboard for the O and added a star chalkboard for accent with the year.
So gonna do this for our family room tree! Give a shorter tree height by placing it in a large urn or pretty pot. You can even cover and ugly pot with your tree skirt!:) Bonus: This also leaves room for beautifully wrapped gifts.