Provide a simple tiled texture
To cover a case of a mix of wide and narrow wallpapers (portrait display mixed in), we should have an option of a tiled wallpaper. I recall having such option, but quickly skimming https://gitlab.gnome.org/GNOME/gnome-desktop/-/blob/master/libgnome-desktop/gnome-bg.c I can't really tell how to produce something that wouldn't get scaled, but tiled.