I used a piece of cardboard underneath to prevent the paint from bleeding. I added the fabric paint with a sponge brush, dabbing rather then brushing the paint on to keep the edges clean.
I was pleased how these turned out and thought I'd share, because they were very easy. I cut out a circle with an exact-o knife from adhesive shelf liner. I stuck it on clean white dish towels, as well as a vinyl letter, centered in the middle.
Peel of stickers while paint is still wet, then let dry.