That, as you know, is the name of the button on Google's homepage you use when you want the first result for whatever it is you're searching for. You normally just think of it as something for the regular searches.
A couple of artists and designers from London, Ben West and Felix Heyes, have applied the concept to Google Image Search. Not only that, they've opted to make a dictionary out of it. What they've done is take 21,000 words out of the dictionary, and run a Google Image Search for each of them. They then took the first result of each word, alphabetized those images by keyword, and bound and printed the result, which they have naturally called 'Google'. It runs 1,240 pages.
They're looking to get a publishing run going- they bound and printed the book themselves- but if you'd like a copy, note that SafeSearch was clearly off, as according to West, "I would estimate about half of the book is revolting medical photos, porn, racism or bad cartoons."Or, if you don't want to buy it, you can try and speed-read it through an animated GIF West made.
You may also get a free preview by typing random words into Google Image Search.