*As with all displays involving string lights, please do NOT leave this prop illuminated when you are away from home.
The cost on this project can be as little as $0 if you happen to have the items on hand, it will take you about 10 minutes to complete (unless your fireplace requires a lot of cleaning). If you have to purchase everything, I would estimate it between $35 and $75.
Step 1: Supplies
Orange string lights
Fireplace (or faux fireplace)
Cat - Not recommended (I dare you to try and stop him.)
*NOTE - The fabric needs to be translucent enough to show the lights, but opaque enough that it's not blatantly obvious what the light source is. If you simply cannot find fabric and/or you don't have a firelog holder, you can "mould" some Great Stuff over a plastic tarp (use empty water and large soda bottles for the armature under the tarp you're using for the Great Stuff). When the Great Stuff is dry, spray paint it black and peel it off of the tarp. It will have natural openings which will create your banked coals look.