Cover glass panels with paper or cardboard. Use a sanding pad to scuff the metal surface and wipe clean with a rag.
Spray-paint the lantern and let dry overnight. Apply second coat of paint and allow to dry thoroughly.
Measure the bottom inside of the lantern and cut a piece of thick cardboard to fit, allowing for 1-2 inches of side flaps, which will be folded up on each side. Arrange plants on the liner, and fill gaps with potting soil, covering the roots. Use dampened moss to cover the soil and edges of the liner.
Attach pieces of adhesive putty to opposite sides of the battery compartment for your string of lights. Press the battery pack into the inside top of the lantern where it will be hidden from view but easy to access for turning the lights on and off.