SpongeBob Teams with USPS, eBay

From now through Jan. 4, kids can get postage-paid SpongeBob postcards at more than 25,000 post offices across the U.S. Resources for teachers and parents are also available online including a video tutorial for kids, customizable and printable stationery and writing-themed SpongeBob video clips.

In addition to the postcards, 30 postal service mailboxes are being wrapped in a custom SpongeBob design across the country.

"This program is a great way to inspire kids to write and send cards and letters because it's

SpongeBob has also become the first animated character to be featured on eBay Celebrity, joining the ranks of A-listers like Brad Pitt, Lady Gaga and Katy Perry.

All proceeds from the charity auction will benefit the Natural Resources Defense Council, an international environmental non-profit. This is first of several Nickelodeon-themed auctions that will take place throughout 2014, benefiting a variety of charitable organizations.

"We are thrilled to have SpongeBob as the first animated character to have its own eBay celebrity page," says Kaufman. "The SpongeBob charity auction will give fans and collectors around the world a chance to own a piece of SpongeBob and his world, while benefiting a remarkable charity with a meaningful cause."