Google announces its sixth annual U.S. Doodle 4 Google competition, inviting K-12 students around the country to create their own "doodle" (one of the special Google logos you see on the Google home page on various occasions).

This year's theme is "My Best Day Ever ..."

The winning artist will see their work on the Google home page for a day, win a $30,000 college scholarship, and win a $50,000 technology grant for his or her school.

The judging starts with Googlers and a panel of guest judges. This year, the judges include journalist and TV personality Katie Couric; music maestro Ahmir Thompson, of The Roots; Chris Sanders, writer and director of "Lilo & Stitch" and "How to Train Your Dragon"; and Pendleton Ward, creator of "Adventure Time"; among other great creative minds.

"On May 1, we'll open up a public vote for the 50 state winners," says a spokesman. "They'll be flown to New York City for a national awards ceremony on May 22.

"There, we'll announce the national winner, whose doodle will appear on the Google home page the following day. In addition, all the state winners will have their artwork on display at the American Museum of Natural History from May 22 to July 14."

For more details, check out google.com/doodle 4google for full contest rules and entry forms. All entries must be received by March 22 with a parent or guardian's signature.

"We encourage full classrooms to participate too," says the spokesman. "There's no limit to the number of doodles that come from any one school or family.

"Just remember, only one doodle per student."