While I've never been much of a live wallpaper guy myself, there's little denying that DualBoot Games (I'm guessing the name is a holdover) makes some of the best and prettiest ones out there. At least, that seems to be the general consensus, judging by the number of downloads their seven wallpaper designs have managed to achieve.
You may say "only seven? how hard can making a live wallpaper be?" Well, DualBoot Games' live wallpapers take it to the next level - the amount of customization and control you can take over one of their creations is mindblowing.