Living textures wallpaper from chaotic reaction-diffusion systems. Many patterns are available, and you can adjust or create your own. It looks just like the screenshots, but moving. A good description of what a reaction-diffusion system is can be found here: http://mrob.com/pub/comp/xmorphia
Please note that, like many live wallpapers, this is a battery killer (but only when it is running). So if you want to stare at it for a long time, make sure that your device is plugged in to the charger. It requires a moderately powerful device in order to be fast--it works well on my overclocked HTC G2 and a Nexus is more than enough.
This app is brand new just published. So if you experience any issues or have any suggestions, please do not hesitate to contact me at firstname.lastname@example.org.