It's a caitian ship from the caitian's personal fleet. kinda like vulcan ships have that reddish hue. This has largely to do with the types of metals abundantly available in a given area. keep em blue/purple
personally, I don't see why they can't add a color wheel sort of thing where you can drag the mouse through the spectrum and choose your color. At least with that there would be more variety without having to create new skins.