I believe a Pictureless Comic is possible.

Joined a comic book challenge.
Sometimes, you don't have to have pictures to see the big picture.
I wonder if they'll like it enough though.
http://www.docpop.org/2009/10/30/comics-minus-comics-a-text-based-challenge.html

See the comic at http://garapata.blogspot.com/2009/11/joined-comic-book-challenge.html