time for a nerd moment, the sith's crystals are corrupted or something so they only give the red colour (at least that's what I believe is the "reason") Initially I'm sure Lucas just used it so personify anger (red) and peace (greens and blues)NoMoreSanity said:I think it's just a nonofficial thing with the Jedi/Sith to distinguish themselves from one another. There are cases though where some on each side have different colors.
Personally I'd have a green one