Here's the mask i made, it's not as good as ComicBookBoy's but what the hell:
http://i157.photobucket.com/albums/t73/pig_****/PJsPictures007.jpg
Sorry i haven't resized yet. Basically, i found a good spot on an unused white t-shirt, drew the image i wanted, and wrapped all the excess back stuff with a rubberband and then trimmed it.
http://i157.photobucket.com/albums/t73/pig_****/PJsPictures010.jpg
The back is a little lumpy, natch, but you can slip it on and off and dont have to re-wrap it. the neck is a little loose sometimes. and i sealed the beack with staples, god's miracle.
http://i157.photobucket.com/albums/t73/pig_****/PJsPictures011.jpg
http://i157.photobucket.com/albums/t73/pig_****/PJsPictures009.jpg
http://i157.photobucket.com/albums/t73/pig_****/PJsPictures012.jpg
Also, note the serenity and casablanca posters in the back

t:
MATERIELS:
A Big white T-shirt
Black Permanent marker (But the mask in the dryer on air-dry to make sure the mask doesnt get you all insane in the membrane)
Rubberband(s)
Staples
Scissors, obviously