A calendar is shown to establish that it is the 25th of December. We then see the Christmas tree, happy, with all the different decorations on it.
The calendar turns it's pages a few weeks past December 25th. We then see the naked Christmas tree with no decorations on it. It feels both sad and cold.
The Christmas tree sees the box of decorations in the distance, and jumps to it. It tips the box over, and throws the various decorations on it's body in a flamboyant fashion. The Christmas tree is happy.
At the moment, this idea feels as if it is too simple, and predictable, I almost feel like adding a twist at the end, but I'm not sure how and whether this would effect the simplicity of it. I was thinking, at the end, after maneuvering all the decorations back onto itself in style, it could do a final jump (like the one's seen in gymnastic events with the finish) back into it's position and then all the decorations falling off?