I don't know if you know how hard it is to make a black lightsaber, but trust me, it's not only a simple reskin, all black parts would get invisible ingame.
Anyway, I have made successfully a black bladed saber with white glow, so if you are interested, check it out.
Looks awesome, doesn't it?
>>>DOWNLOAD IT HERE<<<[
Instructions are in the ReadMe, if you still have questions, feel free to ask.
That's it, thanks and have fun. 8)