A classic way to decorate the front door for Christmas is to use a wreath. You can make one out of evergreen branches, pine cones, and holly berries, or you can purchase a premade one. You can also hang a Christmas stocking on the door, or place a poinsettia plant in a decorative pot next to it. If you have a small Christmas tree, you could also place it next to the door, along with some Christmas lights.