EPHEMERA: any items such as tickets or cards that were originally meant to be discarded after use but have since become collectibles.
EPHEMERIDE: French name of a paper calendar that gave you daily information all over the year.
From this idea and my collection of Ephemera over the years, I get the idea of the EPHEMERID playing cards: each card comes with a unique design based of my thousands of hand-letters, invoices, bills, tickets, and photos!