 The success of Box Cards did not go unnoticed by the major greeting card companies, and by 1957, Hallmark, American Greetings, Rust Craft, Norcross and Gibson Greetings all were publishing studio cards.In the decades that followed, humorous cards evolved through many different approaches at the major companies and came full circle in 1993 when Gibson made a licensing agreement with "Mad" to publish a 1994 line of "Mad" greeting cards with artwork by the "Mad" cartoonists.Hallmark labeled their early 1950s line Fancy Free, and American Greetings called theirs Hi Brows.