Roth Greeting Cards v. United Card Co.
429 F. 2d 1106 (9th Cir. 1970)
A Roth card. Hover to see the corresponding infringing United card.
If you ever get into the greeting card business, not only can you copyright the look and feel of your works, but you can join the Greeting Card Association as well!
Neither Roth Greeting Cards nor United Card Co. still exist.