Hey! Thanks for checking this out. Below is a lot more information about citing sources or random possible QnA answers, but here's the important stuff:

If you don't have it already, a lot of other mods require you to have a StarfieldCustom.ini file.
As far as I'm aware, edits to files for backgrounds like this one don't require it, but I'm mentioning it here just in case.
I'll provide a .ini as well in the optional files.

• Any main menu/background file goes here: SteamLibrary/steamapps/common/Starfield/Data/video
  

• Any audio file goes here: SteamLibrary/steamapps/common/Starfield/Data/sound/SoundBanks
  

• The StarfieldCustom.ini file goes here: Documents/my games/Starfield
  

At the time of me writing this I have no idea how Vortex or mod managers work because I'm a silly little goofball and install everything manually. However, I imagine this would function similarly to however you'd download any file like this otherwise.

I hope you like these mods as much as I do! Making them was super fun and honestly not too hard!

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Here's the video for Looping Stars: this little fella
The one for Neutron Particles: this other fella
And the one for Cyan Navigator: the third fella

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Any questions or otherwise I'd be happy to answer, but I want to lay out some grounded statements first to slap any immediate questions away while I'm thinking of things that might be more commonly asked.

Yes, you can make your own background fairly easily, use Bink.

Yes, Bink tells you to get a license, but you can just rename it to .bk2 while rendering and it works fine.

Yes, you can make things into your own audio files if you want fairly easily, using Wwise (and a YouTube tutorial or two).

Yes, if you have a request, I'd at the very least consider it. That said, I only like making stuff like this as long as it fits the thematics of the game.
I probably wouldn't do anime/pixel/random backgrounds. Just doesn't line up enough in my opinion.