Unmaintained, as I do not use GNOME currently. If you are willing to maintain this, please reach out to me.

gnome-wallpaper-changer

GNOME extension to change wallpaper from providers

Install instructions

git clone https://github.com/Jomik/gnome-wallpaper-changer.git ~/.local/share/gnome-shell/extensions/[email protected]
cd ~/.local/share/gnome-shell/extensions/[email protected]
glib-compile-schemas ./schemas/

Relog and you are good to go!

Folder provider

Looks, by default, for wallpapers in ~/wallpapers and applies them at random.

Wallhaven provider

As default SFW General pictures with the ratio 16x9 from wallhaven.cc and applies them to your pictures. It downloads a page of pictures at once and deletes them as they are used.