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Greeting cards are in full circulation during the holiday season, and I had been thinking a while about something that would be geeky and retro, so I went searching for old-school punch cards.
A punched card (also known by various synonyms) is a piece of stiff paper that contains digital information represented by the presence or absence of holes in predefined positions. Now almost an obsolete recording medium, punched cards were widely used throughout the 19th century for controlling textile looms and in the late 19th and early 20th century for operating fairground organs and related instruments. They were used through the 20th century in unit record machines for input, processing, and data storage. Early digital computers used punched cards, often prepared using keypunch machines, as the primary medium for input of both computer programs and data. –wikipedia