Thanks for this!
The banner area would be a great place for contact info. I tried adding "cp -f /mnt/us/extensions/AdToggle/bin/banner.gif /usr/share/blanket/ad_screensaver/banner.gif" and dropping in a 600x90 banner.gif but it seems to break the script. Any idea why?
Also, it would be great to have a companion extension "WP Update" for changing the wallpaper without having to go through two reboot cycles.