Early last summer I saw this now-dead thread: https://forums.galciv3.com/467536/page/1/.
I'm still with Mottikhan; I'd really appreciate something added to game settings for the mod-indifferent or mod-averse players.
Yesterday I had the best background I've had in ages. This morning when I loaded the game up again, the difference was so stark that I'm trying a reload. I can't quite believe how much difference there is in the screen readability across the backgrounds. I don't even know if it is a set of flat files or custom-generated for each instance.
I also have no idea if it is a modestly demanding code thing. I'm guessing that it is probably not that big a deal and just needs a bit more muttering from the peanut gallery to get it trickled up on the UI polishing task list.
If you love a nice, dark galaxy, please speak up!