First question that pops into mind,
"Who creates these logos?"
That person is
Dennis Hwang
Here you can see a compilation of Google Doodles from the past years, though unsure if it's a complete list.
I find it curious that "Unexplained Phenomena" (found at the bottom of the page) is the only one that isn't an anniversary of sorts, or a holiday ( that I know of ). Although there seems to be many possibilities that may point to otherwise.
So,
"How does he come up with these logos?" Who's ideas are they?"
[quote author=http://www.cnn.com/2006/TECH/internet/07/19/google.logo/index.html]
Hwang said users e-mail from all over the world to praise the designs or petition for new ones.
Hwang said they did a logo for the Persian New Year after a huge online campaign and that the National Library Day design was very popular.
"That one was a huge hit among librarians across the whole country," he said. They even sent me library-related cool toys and hats things like that. One was even a librarian action figure with 'shushing action' so that was really funny."
He said he meets a few times a year with a small group of Google staffers to decide which events to cover.
"We talk about interesting holidays that are coming up, or various international holidays or any current events or news events that we think are cool and geeky or 'Google-y' in some sense and then we just sort of give it a go," he said.[/quote]
It's definitely caused quite a stir, typing in "Google Doodles" into Google search box pulled up a few sites and their speculations on the logos. One of which says,
[quote author=http://www.telegraph.co.uk/technology/google/6192586/Google-crop-circle-doodle-mystery-Coordinates-clue.html]The Twitter message simply reads: "51.327629, -0.5616088", and links to an image of the crop circle logo on the Google homepage, showing the letter "L" being abducted by a flying saucer. [/quote] The corrdinates pointing to 1-7 Woodham Rd, Woking, Surrey GU21 4, UK.
And nine days earlier, on twitter this post:
[quote author=http://twitter.com/googletwitter]1.12.12 25.15.21.18 15 1.18.5 2.5.12.15.14.7 20.15 21.19 http://twitpic.com/giyxf 9:02 PM Sep 4th from web [/quote] Apparently, decrypted as "All your O are belong to us", a reference to the popular Internet meme "All your base are belong to us".
Some folks commenting on the subject have speculated a connection between the logos and H.G. Wells, his birthday being this month, as well as his writing of the novel
War of the Worlds while living in Woking.
Hmm... curious to see this one play out.
Edited: Twitter link in the quote - Moderator.