I have been giving the lightsaber colors some thought today, as I just saw Attack of the Clones for the second time, and I think I can say with some confidence that the lightsaber colors do have some symbolism to them, and the symbolism goes farther than just those weapons.
To start, the Jedi (save Windu) use blue and green blades. The Sith use red. I think we can accept that, in general. Windu’s purple lightsaber is hella cool, so I won’t nitpick. I’m not a total drooling Star Wars fanboy who’s read all the novelizations of the movies, has multiple copies of the movies, all the original Star Wars figures, or read any of the books, especially the one where Admiral Thrawn comes back from the outer reaches of Imperial territory to threaten the security of the New Republic, and locates a rogue Jedi on a planet populated with ysalimiri who have the ability to… er, okay, maybe I am a drooling fanboy. But still.
Just look at this logic for a moment and tell me that the blue/green/red thing is a coincidence.
Naboo: Green and blue.
Alderaan, from orbit: Blue.
Yavin IV: Green.
Dagobah: Neutral gray, a bit greenish.
Camino: Neutral gray, a bit bluish.
Geonosis, inhabited by bad guys: Red, red sky.
Bespin, seized by the Empire: Red-orange.
Bespin guards, Lando’s costume: Blue.
And finally, Tattooine: Red lands, blue sky.
Bespin location of Vader and Luke’s duel: Red stage, blue smoke.
Now, not everything fits into this color scheme. There are villains (Greedo, Boba Fett) that do not fit the pattern. The lasers don’t seem to be particularly assigned to color (TIE fighters, Death Star green, AT-ATs red, X-wings red, Republic army troop carriers green). Don’t read too much into it, because it’s not 100% definitive. I did notice, however, some very interesting shots in Episodes 1 and 2 that make me wonder if Lucas is doing this on purpose.
Anakin is introduced to the Jedi Council. Sunset, red tones.
Yoda tells Windu, “The shroud of the Dark Side has fallen.” Sunset, red tones.
Anakin slaughters Tusken Raiders. Subsequent shot: pan down from blue sky to reddish sands.
Anakin on his mother’s grave. Perfectly divided between blue sky and reddish sands.
Last shot of the film: Sunset on Naboo. Left side of shot, blue waters and green islands and hills. Right side of shot: sunset tones.
Like I said, the system isn’t perfect. There is a significant body of counterevidence that quickly springs to mind, not the least of which is Lucas telling us that it’s all a big coincidence. Give it some thought and let me know if you come up with anything. I just noticed this today and I’ve been going over it in my head.