Whenever I see something, I feel the need to try it, at least once. These are floor cloths, but they are not made out of canvas. They are made from scrap linoleum. You do nothing to the "right" side of the linoleum.
I rolled a a couple of coats of outdoor semi-gloss latex paint onto the "wrong" side of the linoleum. Then I taped off the inner boarder with painter's tape. I painted it with a lighter shade of green. In the corners I used a tatouage rub on. voila! a floor cloth!
I did the same here, a couple of coats of the green latex paint. I then taped off the 3 diamond shapes and painted it a bright yellow. After the yellow paint dried really well, I did another tatouage rub on. After both floor cloths were very cured, I sealed them with a couple of coats of polyurethane.