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.
How to Make a Cardboard Christmas Fireplace. Create a mock fireplace for Santa to come down from cardboard Boxes. This cardboard fireplace can also serve as a focal point to hang Christmas stockings on and for holiday decoration.