These magic message riddles will serve as instant Christmas cards for your students if you print them on card stock.
The riddles resemble QR codes until you raise them to eye level and read the “magical messages” from bottom - indicated by a red number - to top. There are four cards to the page.
Decades ago, these things took me forever and a day to draw by hand. But then I could legitimately challenge my students to draw a message of their own. Nowadays, I use the computer so they just take forever. However, I’ve lost the moral authority to launch my drawing challenge. But the “wow” moment when a student actually sees the message still makes it worthwhile.