DIY Faux Stacked Wood Fireplace- This is one of the prettiest fireplace decorations I have seen! Great project to welcome springtime and summer when your fireplace will be taking a break. Looks like a fairly easy DIY.
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.
DIY Cardboard Decorated Fireplace DIY Cardboard Decorated Fireplace (I first pinned this thinking it was a miniature. But this is more for decorating for Halloween, set decorating, or a starting point for making cardboard furniture or shelving)