A simple bash script using feh and date to enjoy a different background every day!

wallpaper.sh

#!/bin/bash

NIGHT_PAPERS=~/Pictures/wallpaper/blue/*
DAY_PAPERS=~/Pictures/wallpaper/amber/*

if [ $(( $(date --date=now +10#%H) )) -gt 6 ] && [ $(( $(date --date=now +10#%H) )) -lt 19 ]
then
    WALLPAPER_DIR=$DAY_PAPERS
else 
    WALLPAPER_DIR=$NIGHT_PAPERS
fi

# ARRAY=$(ls $WALLPAPER_DIR |sed 's/ /\n/g')
# cd $WALLPAPER_DIR
ARRAY=($WALLPAPER_DIR)

N1=$((RANDOM % $(ls -l $WALLPAPER_DIR | grep -v ^d | wc -l)))

WALLPAPER=${ARRAY[$N1]}

wal -i  $WALLPAPER && killall -USR1 compton /dev/null 2>&1

I drop this script in an i3bar block running at an interval. Changes wallpaper based on time of day. Still testing.