It's not new, but it's newer than 5.4, which is what mint 20.3 uses by default. I'm experimenting with 6.x and may upload an ISO with that in the future.
A user added a gruvbox color palette file to the repository, which you can use to make your own :)
Multichromatic recoloring does work on gifs, but the result is not as good as with jpgs or pngs. I would convert gifs prior to recoloring, then convert back.
@NicklasVraa
@lemmy.world