If you don't have a fireplace, but still want to hang stockings and decorate a mantel, you can craft one out of cardboard! Using cardboard display boards (ones students use for science projects), you can build a realistic (and lightweight) fireplace.
Santas mailbox made from a large box I got in the cafeteria at school. North pole is a carpet roll with a light ball wrapped in foil like paper. There are blinking lights inside the mailbox so it looks magical.