The Blank Sketch Variant cover began with Gen 13. Now it's an epidemic.

Covers which readers can get artists, whether associated with the book or not, to sketch on, making that comic one of a kind. Well, one enterprising fellow going by the name of Barney took a stack to the Brooklyn Comic Arts Festival. And look what they went and did.

The World's Greatest Super Heroes Team Up To Battle Sponge Bob and His Square Pants! @magicwhistle @ComicArtsBklyn pic.twitter.com/NqOyiPhL5f — barneye2 (@barneye2) November 12, 2013

She Has Eyes As Red As Blood! A Hat As Black As Ebony! And Skin As Green As Grass! Simon Hanselmann @ComicArtsBklyn pic.twitter.com/v5eeATsfsL — barneye2 (@barneye2) November 12, 2013

I Am VENGEANCE!!! I Am THE NIGHT!!! I Am THE BAT-WOLF!!! Aaa Hoo!!! Tom Toye @ComicArtsBklyn pic.twitter.com/434YXwYqmM — barneye2 (@barneye2) November 12, 2013

Mallard Martial Arts Mayhem! Can Nixon Stand Against The Deadly Wings of Quack Fu? @yeahdudecomics @ComicArtsBklyn pic.twitter.com/NCn8Zu0vdi — barneye2 (@barneye2) November 11, 2013