Being an artist, I love blank playmats. I just got done doing my first one.
A Golgari playmat with the guild's concept art and "motto".
(sorry for bad quality. My camera's not the best)
Post up the blank playmats you guys have doodled on.
I should probably put something here someday.
Here's a set I'm working on: http://community.wizards.com/go/thread/view/75842/29422241/Corthenhol_--_A_Work_in_Progress