I like that idea as well... I still use the old masking tape and ball point pen and the ink on some of my labels has faded quite a bit. I have heard of using stick on material in the shape of a small circle. Using different colors for the different plugs. I.e. Red on both the left aileron plug, and blue on the right... I have thought this would work, but it probably wouldn't work in the dark though. Although I would have more problems than just plugging in servos if it were dark anyway.