No jailbreak required.
I run the latest beta, so I suppose that wouldn’t have been option for me anyway.
This works only on the iPhone 7 for now. Screen sizes are complicated things to deal with. The second and third pages are still screwed up. The black spaces are filled up black icons. Go here for instructions on creating those icons. Set the wallpaper without any effect.
Feel free to distribute and attribute credit to my Twitter account @thunderror