Since I've already completed 3/5 of the nebulas for
Before anyone cries foul, keep in mind that a star's color has no gameplay effect whatsoever... I certainly will shed no tears over less olive in the game. It's one of my least favorite colors. An olive colored nebula would make me sick.
On a happy note, I'm about to finish up beta version 5 for the nebula retex's... that's 13 nebulas replaced (if you include the strategy starmap and light orange ones... which I assume you will).
EDIT: It turns out the changing a star's color during a game in progress prevents nebulas from loading properly for that star type. So, that file will be included as an optional download at some point in the future.