American Greetings Corp.

The black SpongeBob was a goof in printing, the card company says. Wal-Mart offers refunds but won't stop sales.

American Greetings Corp. calls it a regrettable printing error.

Somehow, boxes of SpongeBob SquarePants Valentine's Day cards are popping up in local Wal-Mart stores -- but the popular cartoon character found inside isn't his traditional yellow color...

AN UN-FUNNY VALENTINE: Greeting card picture evokes race stereotype