Google Images - When searching for some images which are somehow connected with recent events, it shows a little label with its age
Google search - When hovering over a suggestion, you see preview of the image search results for that term.
/via Floris Jansen
Google Analytics - When browsing mobile devices in the new version of Google Analytics, you can get photos of each device to more easily know what device it is.
Google+ - Clicking on someone’s profile picture makes it flip around to show previous pictures.
/via Alex Popov