Evergreen garlands and Christmas stockings belong over the fireplace, but arranging them on the mantel can damage the surface.
Instead, cut a piece of 3/4-inch plywood to the length and width of the mantel. Paint wood and two C-clamps to match the mantel. Place chair glides on the bottom of the wood at the four corners, then clamp to mantel. Tap in nails for stockings and decorative greenery. Store the pieces with your other holiday decorations until next year.
Mantel Nailing Board
Martha Stewart Living, December 2000

Thank you so much for this great idea. Just moved in a townhome that has a recessed niche for the TV over the gas log fireplace leaving no room to hang the stockings. This will allow me a place to hang the stockings, remove when the fire is going and still have a holiday-looking "mantle". Only concern will be the heat coming up from the logs, even if I use artificial garland. Do you think it will be safe? Still a great idea!