I can't really describe the effect of the visuals. The words "sparkle", "smoke", "out of space", "dust", and "ion trail" come to mind.
The only suggestion I have is to have more effects or visualizations in the future. Still, it's a lot more interesting than the default play screen that I get. Having this as an option let's your Android Device feel a little more freedom and customized, which is what the Android platform is suppose to be about. Android could learn a thing or two from here and add more visuals to the Android Operating Systems.