This is one of the educational ones. Greek Myth Comix has Greek mythology in stick-figure format, probably influenced by XKCD.
These can be used to teach kids of all ages about certain mythological figures or ancient Greek concepts, like Kudos or the Homeric Hero.
I especially like the Moirai and the Muses poster, I printed these out and have them on my board for reference.
Make sure you visit their store for neat merchandise or large posters.
Check out our new release, Cyberpunk Fairy Tales, on all stores.