This tiny python script automatically sets the latest xkcd comic as your wallpaper, provided you set the script as a cron job. [Not maintained anymore]
Make sure you install PyGObject:
Fedora (YUM)
yum install pygobject3
Fedora (DNF)
dnf install pygobject3
Debian & Ubuntu
apt-get install python-gi
Clone and cd into the repository and run python setup.py install
To update your wallpaper run xkcd-wallpaper and it should be updated.
Now for it to automatically change your wallpaper, set it as a cron job. Setting up a cron job is easy, you can read about it here.
Will probably look something like this,
