Today we're kicking off the 2015 Doodle 4 Google art competition, where creative and curious students across the U.S. vie to take over the Google homepage for a day with their artwork. This year's theme, "What makes me'me," invites students K-12 to express themselves in the form of a doodle highlighting what makes them unique. But wait don't get out those pencils just yet. This year, there's a twist....