
Google is famed for its Easter Eggs, so much so that they've become a tradition. In fact, a product without Easter Eggs would be the real surprise at this point. Most recently, it had a lot of fun with YouTube, where several imaginative Easter Eggs were unveiled during Geek Week.
Most of them still work and among those, there is a stream of ponies riding along the page, if you know how to find them. Google has a similar pony Easter Egg in Hangouts. In the Google Play Store, Google didn't go with ponies, but didn't venture too far either. If you do a search, i.e. click the search button, but don't enter anything into the search box, you'll get results for unicorns.
Books about unicorns, apps about unicorns, even devices with unicorns,...