I did try to do mono printing using a (small) sheet of glass and some black paint, but the paint was too runny and the bumps on the shoes too rounded. My brayer also left marks on the glass too. I was most successful using paper rather than fabric but overall I'm quite pleased. Especially as the whole experiment took 15 minutes from start to clear up!
For the last one I used a rubber to draw circles on the glass before printing.