Aye, the sky doesn't look like that to human eyes.
If you go to TRUELY dark skies when there is no moon out and completly clear weather, the sky looks far more impressive than that.
Here's a map of light pollution in the US. If you havn't seen the sky from at least the grey areas...you haven't seen dark skies
Nebulosity, to the naked eye, appears grey, without color, although some bright nebula in a telescope might appear slightly green/red.
I think that a sky background that was accurate to what would actually be seen in space would be far more beautiful than the current star backgrounds. However, when I'm playing this game I'm trying to shoot things, not just look at a pretty view. So, having lots of colorful nebula can make it a lot easier to see the ships against the sky. Still, I'd love to see accurate backgrounds and would prefer them over the current ones (although the current ones aren't too bad).