This make combines both natural materials and the very much synthetic. I like copper on wood, I don't like PCBs.
The video shows what you can do by twiddling the "Dial-a-LED" controller, otherwise there are 10 fixed configurations, and 2 off-positions.
Step 1: Materials & Tools
Some local stones
A copper ornament / tourist souvenir
An unusual Japanese telephone
A USB cable (for a camera, from before card-readers were common)
Red micro LEDs 10x from the slider-bars of an old stereo
Yellow 5mm LEDs 8X from old Christmas-tree lights
Green 5mm LEDs 8X from old Christmas-tree lights
Violet/UV LED (bought)
Solid-core mains cable (30A)
Some capacitors from an old stereo
Scissors / knife
2-part epoxy glue
Car body filler (styrene / polyester resin)