Fooling around with particles just for fun, ended up with a waterfall.
It's js-animated so I'm not sure how this runs on an average machine.
Should soon look into animating with shaders instead... :P
Note. You need a modern browser that supports WebGL for this to run the way it is intended.
For example. Google Chrome 9+ or Firefox 4+.
(If you are already using one of those browsers and it's still not running, it's possible that you
have old blacklisted GPU drivers. Try updating the drivers for your graphic card.
Or try to set a '--ignore-gpu-blacklist' switch for the browser.)