I first used fibre optics as a way to light up some signs I made, then came up with another idea. I had quite a few model HO cars on the layout and wondered if it were possible to have the headlights working, so I drilled out the lamp sections and inserted fibre optic strands into the headlamps. Drilled another small hole in the bottom of the car and pulled them through, leaving just the tips of the optics in view. Then I drilled a hole through the baseboard and inserted the optics. Got hold of piece of brass tube 1/2" dia. and 2" long and inserted a grain of wheat bulb into it. I then taped up the brass tube underneath the baseboards and connected the wires from the bulb to my transformer, it worked, my car now had headlights. Must do some more later.