Edit 1/21/2014: a comparison between Adam Lanza’s illustration for the cover of the “Big Book of Granny” and the Blarvink’s 2draw contribution:
2draw appears to be a site where one can draw in-browser, submit the drawing, and field comments on their work. Blarvink (believed to be Adam Lanza) contributed a drawing “Elder Crying Over Nuclear Weapon” in 2005 here.
…what is more interesting is that in this drawing’s comment section, we can see Lanza’s efforts to erase his internet footprint. Four years after he posts the drawing, he’s trying (and failing) to delete it: