From Universal Press Syndicate:
Beginning April 1, Recycled Paper Greetings (RPG) introduces an exclusive collection of cards featuring the comic panel The Argyle Sweater that will be available through mass retailers, drug stores and specialty stores nationwide. Included in the April launch are 12 birthday and just-for-laughs card designs. The Argyle Sweater is syndicated by Universal Press Syndicate.
Here's a video featuring The Argyle Sweater creator Scott Hilburn talking about the new card line:
And in case you missed it, here's an animated The Argyle Sweater cartoon that was created to promote the new book: