For color tweeking-you pick one of the colors that costs 5.00 extra (arcttic blue, srd, va). So far the typical special colors that are normally asked for are: Sentinal Yellow, Pyrestone Orange, and Dark Violet Amethyst. Any other color that you may think of such as (example) a light consular green or a dark consular green, I would email US and ask if it can be done.
Sentinel Yellow is a really great color!
P.S. If anyone does get a yellow saber and decide to RP on the forum come talk to me if you're interested in being a sentinel. I'm the Leader of the Sentinel Division in the RP and well as of right now I believe i am the only one.