How to make a beacon beam change color?

I'm making a little minigame in Minecraft, the aim of the game is to take control of the point. A point is denoted as having a beacon on it. How do I make the beacon change color depending what color team is on the point. For example in the image the orange team in on the point so I want the beacon to turn orange. However if two teams of different colors are on the point then it stays white.

You can change beacon colors by placing a colored stained glass block above the beacon's light.

You can combine several different colors to make different colors to create different hues.