Google has many side initiatives, and one of them is the Cultural Institute that digitizes works of art from museums and archives around the world and puts them online.
Today, their Art Project released an app for Chrome OS that updates the wallpaper of your device to a different piece of art from their collection every day. Expect "masterpieces ranging from Van Gogh and Monet, all the way to contemporary works from street artists around the world," according to Chrome evangelist François Beaufort in announcement post. If today's piece doesn't jive with your artistic taste, you can skip to the next wallpaper in the app.
The Chrome app is very similar to the Muzei Live Wallpaper app by Googler Roman Nurik that also changes the wallpaper on your phone and Android Wear watch face to a work of art. Another app that features work from the Google Art Project is the Street Art watch face for Android Wear. You can download the Google Wallpaper art app from the Chrome web store.