One of my favorite live wallpapers is Vortex Galaxy. It has swirling, vibrant colors which can be customized - just gorgeous! I also really like the Aquarium live wallpaper by Kittehface. The fish are rendered quite well and there are lots of customization options. Another go-to wallpaper for me is Multi-live wallpapers - makes your tablet a picture frame with a continuous slide show.
The H2O wallpaper included in the tab by Asus is also quite good - and functional. Not only does the water look surprisngly real, but the level indicates the remaining charge on the tablet and bubbles percolate to the top when the tablet is being charged.
Live wallpapers - one of my favorite features of Android!