Wow, I just discovered an awesome easter egg from Google. Check this out (applied to all browsers)!
Go to Google search and search something. The Google logo in a top-left corner would appear , something like this:
Then, right-mouse button click and "Open Image in The new Tab"
And you'll probably get the same result I did:
That's just their image sprite! It's a way of serving image icons that saves of server calls & downloads for users, making websites load faster... Not an Easter egg. You could see any websites sprites the same way...