Let's put a smile on that face.
Home -> Menu -> Wallpapers -> Live Wallpapers
Scroll down the list, find out the wallpaper and setup it.
Note: It is live wallpaper so you can't open the app, you will need to follow the instruction above in order to set the wallpaper. Also slower/older devices (shipped with Android OS below 2.1) can't run it too.
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