I definitely like the GMail Motion as my favourite, are they teamed up with XBOX?
Or perhaps their job posting about becoming a Google Autocompleter
Google also allowed you to search for "Helvetica" or "Comic Sans" and return the search query in that font
Some of my other favourites are Linked-In suggested you might know Dr. Watson, Sherlock Holmes, Robin Hood and other characters. Funny-or-die.com had a "Rebecca Black" only home page. And the online gaming site Destructoid.com re-wrote their entire blog in hand writing. Hulu.com changed their home page back to Netscape 4 style.
And last but not least. ThinkGeek introduced their "Apple Store" set, with optional "line"