Random betterlockscreen
Quick hack to set random image for the lock screen with a helper script and crontab. In order to make this a bit more useful I'd need to add a YAML config parser.
Installation
I've set it up with a crontab for my local user:
*/30 * * * * /usr/bin/python3 ~/bin/betterlockscreen_random.py
Systemd timers could also be an appropriate setup.