http://www.openculture.com/2019/12/when-salvador-dali-created-christmas-cards-that-were-too-avant-garde-for-hallmark-1960.html

Hallmark cards signed Spanish artist Salvador Dalí on in 1959. The painter of The Persistence of Memory and Crucifixion (Corpus Hypercubus) asked the greeting-card giant for "$15,000 in cash in advance for 10 greeting card designs, with no suggestions from Hallmark for the subject or medium, no deadline and no royalties."