These cards are back from 2011/2012 while I was working with Lena Hallgrímsdóttir on Icelandic. When you learn a language you learn a culture. She had taught me about the thirteen yule men, or Christmas elves, the Jólasveinar as they are called. Jól is the Icelandic yuletide. Their mother is a troll who eats children (Grýla), and she also has a cranky husband (Leppaluði) who helps her out. Her cat, the "yule cat" will eat you on Christmas day (the dreaded Jólakötturin with gleaming eyes) if you don't wear a new piece of clothing. Clothing is usually knitted Icelandic style (prjóna) to make lopapeysa sweaters and anything you can imagine.
I synthesized all of the bogeymen-conversion to yule men by taking a Michel Gagné type of approach to characters. The author of the Phantom Tollbooth, and writer, Sjón do the same thing; basically visual kenning play.
Take a characterstic like lust, grace, or stupidity and give it a face. Depict and illustrate "characters" for whatever it is you choose. Mine became kind of a take on Dante's Inferno in a way. I illustrated these right before American Halloween.