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I’ve replaced the Ubunutu/Gnome screensaver with the superior (IMHO) Xscreensaver, using this guide.

I like the VidWhacker module, and have it set to choose a random image from my ~/Pictures/ dir. I wanted to save some of the funky random images it produces, so I did this:

while true; do /usr/lib/xscreensaver/vidwhacker -stdout | convert - `date +%s`.jpg ; echo "Generated jpg"; done