It would be even cooler to have a lot of drones with red, green and blue LEDs.
You could have them fly in a grid and coordinate the brightness of the RGB lights to play a video.
Could also connect them just at the top, so you can have a wire that is not isolated and higher voltage (less loss)
You could also just hang up an electric wire with light bulbs at this point.
Only power and ground were supplied through the two wires connecting to each pixel. The pixels were PIC micro-controllers which contained the brightness levels for that pixel, which would play on loop independently. As I remember, the whole array would loose power intermittently to deal with clock drift.