Apparently, this spanish artist–Juan Francisco Casas, does these huge hyper-realistic pictures using only a blue Bic pen. They are huge and look like photos at first glance. Really impressive! More neat pics on his website (seems more a tad slow, though).

Here’s another:

And I found these on flickr:

Juan Francisco Casas
Originally uploaded by greta_y_doraimon

Juan Francisco Casas
Originally uploaded by greta_y_doraimon