Helicopter Enema

This is a combination of luminous neon balloons and luminous lumina.

Insufflate the large bowel with neon. Launch five tiny helicopter drones powered by positronic-electronic annihilation and guide each into a strategic position in the colon: one just before the sigmoid, one at the distal end of the descending colon, one on each side of the transverse colon and one just distal to the caecum. As they hover in position, each shoots a beam of leptons along the line of sight to adjacent drones, thereby causing ionisation and luminous neon. Use the neon to illuminate one's surroundings if one lacks a handy light source of another kind.

Clearly the positrons would have to be very limited in quantity but the problem of not being able to close a circuit would be solved (and I'm not sure that was a real problem because lightning). They can be harvested from the ionosphere during thunderstorms and stored in magnetic bottles inside the drones.

Or:

Helicopters are a convenient mode of transport. Rather than having to manufacture them, allow them to reproduce sexually and grow by storing genome-like information in helices of silica units containing extra atoms as codons. This could produce single-piece helicopters which grow in a silicon-rich broth, eat and excrete like animals, and lay helicopter eggs containing more silicon- rich broth gradually being assembled into baby helicopters which then hatch out and grow. These helicopters would spin rapidly like sycamore seeds, but a gimbal-based seat could be used to house passengers.

If something goes wrong with these helicopters, simply diagnose the problem by giving them enemas and inserting endoscopes.