Perhaps you've heard of a little app called DashClock? The creator of that mega-versatile widget has just released a new app, but this time it's less utilitarian. Muzei Live Wallpaper takes pretty pictures, adds some Gaussian blur, and slaps them on your home screen.
Each day the app will get a new piece of art to serve as the base of the background. You can go into the Muzei app to see the piece in more detail (in immersive mode), or double tap on the home screen to clear the blur effect for a few seconds.