I remember when I first put a D7 model together (probably AMT), I wasn't satisfied with the color. So I painted it glossy black. It looks downright scary that way.
I saw one someone had painted as if cloaked.
Airbrushed black, with a random starfield all over it as if you were seeing through it.
That would only work if both it an its enemy were not moving, otherwise you'd see the painted stars moving.