Things you'll need:
Lava Lamp (does not need to be working)
Nightlight or other form of LED (I found blue works the best)
Pliers or wrench
Spray paint for looks
Cardboard or other thick paper
Small amount of tape
Take the glass lava part off and save it however you like. Remove the light bulb and get ready to dismantle.
You are now left with a nut in the middle. Use your pliers or wrench to take this off. This will release the light socket. For now just all the socket to gently hang there.