As part of Earth Month 2008, Wal-Mart and Kellogg’s will be partnering to give away one million custom-made reusable shopping bags on Saturday, April 19th at 8AM local time. (While supplies last). You can also buy reusable shopping bags at Wal-mart for $1.

Kids can also pick up a Nickelodeon Wildflower Seed Card starting at 8AM local time. The cards can be planted under 1/4″ of soil to produce wildflowers that can help create great environments for honeybees and birds.

The back of the seed card also has an invitation to play The SpongeBob Eco-Adventure game at http://www.biggreenhelp.com/, the game where you can help SpongeBob and Patrick save Bikini Bottom from an undersea avalanche of un-recycled trash–and the dreaded dirty bubbles.