An update to the Chromecast app for iOS will now let you activate a nice screensaver for your TV populated with all sorts of web content. Backdrops can include Google+ photos, curated artwork, news and lifestyle pictures, satellite imagery, and lots more. If you're looking for more information, just crack open the Google app and ask "What's on my Chromecast?" The Chromecast app itself will also have more information on what images are being shown.
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