I have always admired Yves Klein's work, and lately I've been really interested in his Anthropometry of the Blue Period and Fire Paintings. In the first one, he uses bodies instead of paintbrushes, and in the second one he uses spray for getting the silhouette, always ending up with stunning and monochromatic paintings.
Anthropometries of the Blue Period:
He also did Art Shows, and made people understand the way he worked.
-Photographs: Google Images.