Take such a ring from a lamp holder an cut it down as you see. Put away the small candle holderm from the bottom of the lantern. Then put disk of wood or "Vulkanfiber" (a special sort of paper used normally as a welding protection shield) on the bottom. Place the brass ring avbove. Take an old CFL-bulb as you see in the picture. Cut the electronic part away and take only the glass tube and the plastic bulb.
The electronic I used is the same like in my other projects, -a high voltage tranformer from a disposal camera- (see the modification at my first project:"high-voltage-ignited plasma-bulb"). Put this electronic and the batteries in the top of lamp. On the top of the lamp there are several holes looking like stars. There you can place copper disks and screws for decoration and also the switch can be installed there.