Wow, I just saw this when I was doing a search and had to comment. Okay, the color of a lightsaber IS determined by the crystal. Also, the lightsaber can be virtually any color. The most commonly used colors are blue and green, because those are the colors of the crystals from Ilum, the planet where the Jedi get nearly all of their crystals from.
A misconception I saw throughout this thread was that certain people use certain color lightsabers. Anyone can use any color. The reason why most Sith use red is because the planet they get their crystals from spawns red crystals. But in EU we see plenty of Sith who use other colors, such as Exar Kun using his double-bladed blue, and some Jedi who use red.
In KOTOR, the color of the crystal you would use depended on the class of Jedi you would become: blue was for guardian, green was for consular, and yellow was for sentinal (KOTOR-only class). These classes are from the Roleplaying Game. Guardian are more focused on the use of lightsabers, whereas consulars are more focused on using the force.
But that is from the video game, and may have no bearing in other versions of the Star Wars universe. But it is a fact that the color does not determine the ranking. Obi-Wan Kenobi uses a blue light saber throughout the movies and in both episodes III and IV he is a Jedi Master. Another thing, JDub2, is that you left out the Jedi Knight, which is what most Jedi are, and is what Obi-Wan is in episode II and Anikin in episode III.
One last thing, here is a list of colors I have compiled:
-Green
-Blue
-Red
-Purple
-Turquoise
-Silver
-Viridian
-Orange
-Yellow
-Bronze
-Maroon
Those are the only eleven I can remember right now, but there may be more.
i think a lightsaber that is like fire looking but changes from blue fire to red fire to green fire depending on force balance and what is happening.
enemies near/ good people being killed=red flame
force peacefully balanced/no danger or war=green
person holding the lightsaber doing good/slaying sith=blue
also if you foucoused on your lightsaber it would tell you the odds of winning a battle or which side had the advantaage
odds of winning / whos advantage=
red= sith side has odds/advantage
blue= jedi side has odds/ advantage
My favourite colour in the films is green, then purple, then red and I hate blue.
My custom would be double white because it kickes so much ass!
Yellow would be cool.
And orange, copper, gold, anything like that is shit!
P.S.
Yellow=level 1
Blue=level 2
Green=level 3
Purple=level 4
White=level 5
Red=Evil
Yoda I think should of had white becuase he's the strongest and would look soooooooo cool in star wars 3 against Darth Sidious aka Palpidou