finally have my beautiful cdf back.
change wallpaper to random img script, using crontab to run that script every 60 minutes
$ crontab -e
MAILCHECK=0
*/60 * * * * ~/.dotfiles/wallpaper.sh
Possible functionality to scan the images so that images that are bright are shown in the morning and images that are darker are shown at night. Possibly make two scripts: one script that is run from 8am-7pm that has an array of images that are brighter and another script that runs from 7pm-8am that is the opposite.