to me it would of made more sense to make TTT:ee the blue one and ROTK:ee the red one, because those colours are more consistent with the tones of the movie and what we see. Helms deep is very blue toned, and mordor in rotk is very red. ROTK in general had a very warm tone to it while TTT had a very cool tone to it.
Things like this prove that I need to get a life