Edited to add: the free printables I based these on are found on Allison Waken's blog HERE and HERE
I wanted to make a stocking stuffer-type gift for my grandsons, and landed on a printable of holiday joke lunchbox notes. I wanted the answers to the jokes to be on the backs of the cards instead of the fronts and I wasn't lovin' the artwork so much, so I just used the jokes from the printable and broke out my stamps and markers to make my own. They are 2 1/2" x 3 1/2" with rounded corners (love my Corner Chomper!), and there are eight cards in each set. (I made two different sets) They slide perfectly into those little plastic sleeves designed for trading cards! Fun project to make, and I'm sure that the grandsons will delight in asking everyone around them the riddles...