xfce

First off, open a terminal and type xrandr, scroll up and it'll show the name of your display here: Then for your program, you'll want to make a launcher on your desktop or something, and for the command line use this template: bash -c "xrandr --output VGA-1 --mode 640x480 &&...

Alright so XScreenSaver is an open-source program that comes with a fuckton of screensavers in linux. A lot of desktop enviroments use it. Now someone under the name of "katahiromz" has ported it to Windows under the name of "XScreenSaverWin"... only thing is you gotta pay 10 USD for it...