Here's a nice Easter Egg from the old Google Play interface. You can still find it in
Google Cache: scroll to the bottom of the page, click the colorful bar next to the footer and you'll see the Android mascot. Click the robot and it will start dancing.
I uploaded a video that shows this Easter Egg:
Music:
Teddybears - Cole (Zero Gravity Reveal Mix). The song was also used in the
Google Music tour and it's available for free
here.
{ Thanks, observant tipster. }