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.
We love this idea for using coffee filters! Perfect idea if you are not expecting snow this Winter in particular! DIY Coffee-Filter Snowflakes: Make a beautiful cascade of snow in just a few simple steps
9 Ways to Hang Stockings If You Don't Have a Mantle