I finally found the source file for that. I posted a screenshot of my phone months ago and people were asking for it, but I had no idea where it was. A little late, but I guess I finally delivered lol.
I made a live wallpaper using an Android app called Magic Fluids (https://play.google.com/store/apps/details?id=com.magicfluids) that is fully black, but creates a flame effect every time I tap the screen or slide my finger across it. Yeah, edgy and tacky AF, but it really is a pretty cool effect and I've been using it for years, so whatever.
I believe it was just a one-time purchase for the full version of the app. The animations don't loop very well, but I'm not staring at my home screen long enough to see the loop that often, so it's not a big concern to me. They're pretty much all swirly, inky, starry sort of abstract animations, but there's a lot of color options so it's pretty easy to pick something that fits well with the rest of your phone's theme.
The developer hasn't updated it for over a year now, so if the previews don't look like something you'd like, I wouldn't bother buying the full version since it's unlikely that any more will be added.
I use Square Home and for my icons I use the Shimu Icon Pack. I jack up the icon size to fill the square home squares, turn off text and leave it at that. Simple square shapes (why does everyone lovvvveee rounded???) with clean and colorful pastel colors, just the way I like it!
I don't know, I was originally a big windows phone fan because I loved how minimal and clean the UI is. I still still think the entire phone market has been going the wrong way ever since with 3d backgrounds, super high resolution wallpapers, lots of fiddly animations and text heavy interfaces which makes no sense, after the 1000th time looking at your home screen you are literally never reading any of the icon text?? You aren't consciously perceiving a highly detailed background. So why have it? Do people really think that the way the human brain works is after the 1000th time looking at a familiar scene the brain's visual perception literally reads the same damn tiny text over and over again? That would be an exhaustingly inefficient way for the brain to process the world.
Ughh I hate how android is either an apple cargo cult or somehow even worse.
Welp, at least I can set my launcher to whatever I want!
(High resolution cool backgrounds are cool, not trying to hate on other people liking them).