Wanted to add...
I thought they got the illumination from the display backlighting, but I read from a reply on this post and from other websites that they can be modded by changing out the led that is used to light up the alien head logo on the m11x and m14x. I've never opened up any of these models so I don't know myself. But from the AlienFX software on both that I own, there is no option to adjust the color or effect on them.
So if you don't like the standard white, modding them by opening up the laptop cover and changing out the led to another color would be the only way. But then you are still stuck with a single color that can only be changed by doing that all over again, so I am not sure I would bother going through all that for myself. If it ain't broken...