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)
Step 2: LED Assembly
In this sequence I've drilled holes for 10 tiny red LEDs, one hole for each pin. Friction was enough to secure these, although glue could have been added.
Wire the LEDs in series pairs with bell-wire (see schematic)
The leads to the left are for the +ve supply, the leads on the right for the ground (-ve).
Later the GND leads will connect to a big copper bus-bar, the +ve wires will be guided down to the base and secured.
Step 3: Power-bus assembly
Bend to shape
Drill holes in the wood to accommodate.
The copper "object" was blasted with a heatgun to melt the solder that held it together and a of the few pieces were used to join the bus-bar together at junction points
The images show the ground (-ve) metalwork, the +ve power buses were made from bell-wire.
The copper is all friction-fitted, no glue required.