Just quarantine things!.

Shuffle and set wallpaper for desktop and with a blurred one on lock & login screen

Tested on Ubuntu 18.04 (LTS) and 19.10 (Latest Public release as of now). Supports default Nautilus File Manager.

git clone https://github.com/dev-ritik/ShuffleWallpaper.git
cd ShuffleWallpaper
# Install convert
sudo apt install imagemagick-6.q16
sudo chmod +x install.sh
./install.sh

Edit /usr/share/gnome-shell/theme/gdm3.css around line 1173 (grep -n -A6 lockDialogGroup /usr/share/gnome-shell/theme/gdm3.css)

Replace

#lockDialogGroup {
  background: #2c001e url(resource:///org/gnome/shell/theme/noise-texture.png);
  background-repeat: repeat; }

with

#lockDialogGroup {
  background: #2c001e url(file:///usr/share/backgrounds/blur-background.jpg);
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center;
}

Images can be:

• SetWallpaperNow: Applied as wallpaper now
• SetAsFavourite: Added to favourite to shuffle and apply whenever required
• SetAsDefault: Set a default wallpaper to revert to easily

by right clicking any image on Nautilus

• To shuffle and apply an image, run update-wallpaper
• To revert to the default one, run set-default-wallpaper

Custom key bindings comes very handy whenever using those commands. You can set custom bindings with custom scripts easily. For help, see this. (For example I have set Ctrl+Alt+s for update-wallpaper and Ctrl+Alt+d for set-default-wallpaper)