Something from your favorite webcomic. If you do not read webcomics, any fiction will do.
Some people choose to draw inappropriate things.
A decapitated horse-monster thing that is planning to rule the world
evil nazi pony with a quid arm
nazi pony with a tentacle in place of one of his hooves and a necktie. His cutie mark is the Geico money face
Doodle or Die is the game of "telephone" with drawing!