There are wallpaper apps. And then there's Muzei.
Technicalliy Muzei — named for the Russian word for "museum" — is a live wallpaper app, but not in the traditional sense of things moving around in the background. Instead think of it is a powerful wallpaper-a-day app that's able to pull in material from any number of sources. In fact, the app itself is open-source and extensible, which has let to a pretty active Muzei community.
It's beautifully done and helps make your devices look that much better.
If you're looking for a wallpaper app, give Muzei a try.
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