While that is an interesting suggestion, I would personally want to keep it green. That is one of the great things that came out of ROTJ imagery was the green lightsaber, IMO. Plus it breaks the visual monotony of blue saber duel in ROTS, Blue sabers in ANH, ESB, then ROTJ....why so much blue? Neat idea though, would be a cool bonus feature if anybody wanted to take the strenuous time to re-color it in every shot.