Touch to turn on flash lights

Problem: Flashlights burn through the batteries when left on, especially by children

Solution: Touch activated flash lights

Having come across another dead flashlight today, I find the need to protect my precious source of photons. It would be cool to have a flashlight that has no switch and is on if and only if the body of the flashlight is in contact with skin. There are various skin capacitance measuring methods to achieve this. My favorite, from an pure art viewpoint would be to have two tones for the two halves of a circuit. This could be a pretty pattern or just a grid, and touching two colors would turn on the flashlight. My child would be entertained until the batteries died.
That’s it. A simple, small idea of the day.