Blue And The Green LiteSabers....

In the KoTOR games, blue is for jedi guardians, green is for consulars, and yellow is for sentinels. But I think that is just for the games.

this is the inside of a lightsaber. The crystal determines the color. take out spaces and go there.

saberstylemasta posted something from this site. this takes you thru everything you wanna know about a lightsaber

http://www.howstuffworks.com/lightsaber.htm