Live wallpapers are always fun to use and show off. Post the ones you like and use! Try and post video and/or a pic... this is only for live wallpapers, not static ones.
I'll start...
Pixel Zombie: war of the pixels on your screen
AniPet Koi: koi fish swimming around your screen
Shake them all: android robots floating around your screen, interacts with sound, touch, accelerometer
Seeds of life: sperm