Google is celebrating the first day of summer with a logo enhanced by Japanese artist Takashi Murakami, of whom I've long been a fan. I have to give it up to Google for brightening my days with the enhanced logos. Recently Google had a series of illustrations intertwined with the logo by Roger Hargreaves, creator of the delightful Mr. Men and Little Miss books for kids.
Google occasionally gets interactive--such as marking the birthday of Les Paul with a strummable guitar graphic and commemorating Jacques Cousteau with a changeable view through the portholes of a submarine. Everything you want to know about Google "doodles" is outlined here and you can view an archive of the images.