If you want to use them, why not give Linux Mint 22 Beta a spin? You can find the wallpapers in /usr/share/backgrounds/ if you want to copy them and take them to your preferred operating system.

Linux Mint 22.1 officially arrived at the end ... There are also some more cosmetic changes in Mint 22.1 – desktop themes, wallpapers, and other visual elements, including changes to wallpaper ...

Linux Mint 21.3 is going to be the last release ... one of the main attractions for upgrading for some people as the desktop wallpaper is a prominent feature of any computer.