A long time ago when I started to get into computers I was in love with screensavers. Even to this day one of the first things I do on a new system is make sure I have xscreensaver installed. When I went through school and started to learn how to do some graphics programming I created a screensaver of my own. And then many years later I decided to port it over to webgl and make it act as a screensaver for a webpage. Pretty pointless, but fun.
If you would like to have this on your own page download screensaver.js and then add the following:
<script src="screensaver.js"></script>
<script>screensaver().initialize({ delay: 5000 });</script>