Of course, you can do this with X11.

It's quite easy:

• Install xscreensaver from potato
• Deactivate xconsole (s/run-xconsole/no-run-xconsole/ for xdm.options)
• Activate xmatrix (add "run-xmatrix" in xdm.options)
• Deactivate Xbanner if installed (vi /etc/X11/xdm/Xsetup_0)
• Add support for The Matrix to /etc/X11/xdm/Xsetup_0
• Add support for The Matrix to /etc/X11/xdm/Xstartup_0
• Restart your XDM

   if grep -qs ^run-xmatrix /etc/X11/xdm/xdm.options; then
       # kill any running xmatrix
       pid=$(cat /var/run/xmatrix_0.pid 2>/dev/null)
       if [ "$pid" ]; then
	   kill -9 $pid 2> /dev/null
       fi
       rm -f /var/run/xconsole_0.pid
       xmatrix -root &
       echo $! > /var/run/xmatrix_0.pid
   fi

You will have to add the following blurb to your Xstartup_0:

   if grep -qs ^run-xmatrix /etc/X11/xdm/xdm.options; then
       # kill any running xmatrix
       pid=$(cat /var/run/xmatrix_0.pid 2>/dev/null)
       if [ "$pid" ]; then
	   kill -9 $pid 2> /dev/null
       fi
       rm -f /var/run/xconsole_0.pid
   fi

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