Curioso!

The following command selects a random picture from the directory for the current year, copies it to the file random.jpg and stores the path in file.txt.

#!/bin/sh
cd $HOME/public_html/images
year=`date +\"%Y\"`
file=`/usr/X11R6/bin/xscreensaver-getimage-file --name $year`
cp $file random.jpg
echo $file > file.txt

It can be used to generate a random background image by e.g. running it as a hourly cron job.