A Black Top Hat is a delightful Christmas Tree Topper.
It can be whimsical or more serious, depending on the style and what you think of when you see it. Frosty the Snowman comes to mind, but so do Dickens "A Christmas Carol" or just Victorian Carolers. I even found one with a Frosty head and arms that wrapped around - how clever!
I looked specifically for this color as that is the first thing that comes to my mind. However, red or red plaid would also make a nice accent. I will research those later and post some choices.