I concoted this from exisiting code over the internet. This code displays a random image from a specified directory (all subdirectories included) as a wallpaper in lxde. This is working for me under arch linux.
#!/bin/bash
DIR="/put/your/directory/here"
# failsafe - fall back to current directory
[ "$DIR" == "" ] && DIR="."
# save and change IFS
OLDIFS=$IFS
IFS=$'\n'
# read all file name into an array
fileArray=($(find $DIR -name "*.jpg"))
# restore it
IFS=$OLDIFS
# get length of an array
tLen=${#fileArray[@]}
FLOOR=1
while [ 1 -eq 1 ]; do
number=$RANDOM
while [ "$number" -le $FLOOR ]; do
number=$RANDOM
done
let "number %= ${tLen}" # Scales $number down within $RANGE.
pcmanfm --set-wallpaper "${fileArray[$number]}" --wallpaper-mode=fit
sleep 10m
done
