First off--probably the most awesome use of granny squares ever. I like that it isn't a traditional square shape, and is just the outline of Mario. Even so, this thing must be pretty huge. I think there are over 350 granny squares on this thing (Geek Central Station).
I love this Super Mario! I used to help my Grandma Smith make these squares for tissue covers and the like, and I am not sure why I never thought about making 8 bit art with them. I might have to get started.
BTW: are these really called granny squares?