Probably the worst wallpaper ever made...

[Verbal]

I was just thinking the other day... is there ANY way to create an animated wallpaper?

Yessir there is. You have to make the animation a .GIF, and save it in a webpage format. You can then enable Active Desktop in your desktop properties and select the webpage (Saved on your HD obviously).

Oh, and this is only for PCs... I have no idea about Macs.