I kinda find it funny that so far, there's only been 3 or 4 lightsaber crystal color mods.
but in Star Wars the old republic, there's so many more including colors with a black center in the blade of lightsabers, my favorite so far is the white with black, purple with black, and silver/gold with black. Unfortunatly, I personaly don't know how to mod without muddy-ing up the game files and breaking the game yet, and I do know that it involves an editing program of sorts (from posted videos on how to mod and edit existing crystal colors on here) to make a mod.
Simply put, I'm just too inexperienced to do this just quite yet myself as well as cautious/afraid to break the game to the point where its unplayable anymore, as well as not just simply be a color replacement for an existing color,, but aa true new color crystal in the form of a mod.
I don't know, it may seem like rambling from a random person I guess, and its possible it would make the game not be able to handle it or something as well as be "too much effort and time", but haveing more colors than are already there, would be really neat I guess.