This is a simple animation of flying through clouds as a website background.
It could be tweaked to fit your needs by editing the (colors, speed, etc) in the Clouds/plugins/default/js/clouds.php file.
If you are going to start wanting effects then you use HTML5, why would anyone want to put more resources on their Server? Nice effort though.
Nice work.. But it consumes a little the resources of the machine. thx