Wish I could do this to the gas fireplace in my bedroom. Hubby said no. :( Turn a non functioning fireplace into a practical and pretty storage space by outfitting it with shelves. Measure the opening and build a plywood insert to fit snugly inside. Cut shelves to fit across. Then paint the pieces and wallpaper the back of the insert. Screw the shelves in place and set the insert in the firebox.