From Apartment Therapy
Heike Weber is a German installation artist who creates large scale pieces using heavy repetition. While she does painting and drawings on paper, her installations using permanent marker across floors and walls (in areas sometimes larger than 5,000 square feet) are quite amazing and beautiful. While I don't know many people that would allow their floors to be adorned with doodles in permanent marker, I think I could be compelled if Heike was doing the work.
And some of her works on paper:
[via Hey Lady Grey via Apartment Therapy]