Added wire slot and LED chamber as well as bottom cover. Used with my custom DIY USB connector (https://www.thingiverse.com/thing:2884714) one LED, two paper clips, one 100 ohm resistor, two wires, some hot glue and solder and you have a crystal lamp.

Do not attempt electrical work without proper working knowledge of electronics. I offer these instructions up for theoretical understanding only and take no responsibility for any damages you may accidentally cause to your devices or to anything else.