CNET reporter Daniel Terdiman visited with the Doodle team last month to discuss the creation process and to see several upcoming logos.
One of the doodles in progress was this one, which celebrates the 25th anniversary of the discovery of fullerene, the so-called "Buckyball." It was created by team member Jennifer Hom and was published Saturday.
Editors' note, Tuesday 6:13 a.m. PDT: This slideshow has been updated with three new images (Nos. 5-7) that capture the most recent doodle, an interactive one that responds to movements of your mouse cursor.
This is the image that ran at the end of that week, after days of doodles that celebrated individual characters from the show.
The challenge? "To work their artistic will upon our homepage logo."
This is the winner from an Australian version of the contest.