It's the same as doing it with a mono-colour LED, excepting what you want to do with the LED. You need some kind of driver for the LED such that it changes colour?You probably want to root around the internet (can't do that for you right now)L
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Well, you would need 2 switches. A 2 color led has 3 pins, one in the middle usually for negative, and the sides for each color, usuallu positive, you would just need to wire in a second switch. Hope i helped!