background

wallpaper management is provided by feh in the default configuration, and can be determined in your $HOME/bin/start/your_wm_start.sh..
but if you want to choose your wallpaper the gui'way, livarp includes nitrogen.

nitrogen can be found on the different livarp menus: section configuration:background/wallpaper.

if you want to restore the wallpaper set by nitrogen, you have to edit your $HOME/bin/start/your_wm_start.sh or $HOME/.config/openbox/autostart:

• comment the feh line (add a "#")
• uncomment the nitrogen line (delete the "#")

random wallpaper

to display a different wallpaper for each session, and change during the session, we will use feh. Here is a small script that displays a random wallpaper from a folder specified at the beginning of the session, then change the wallpaper at regular intervals

#! /bin/sh
# random wallpaper script
# images directory
DIR="/path_to_directory"
# wall rotation delay in seconds
INT="600"
while true; do
find $DIR -type f -name '*.jpg' -o -name '*.png' | shuf -n 1 | xargs feh --no-xinerama --bg-scale &
sleep $INT
done
exit 0

you just have to run this script from one of your $HOME/bin/start scripts.

# random wallpaper
randwalls.sh &