with it I made this bag. I used acrylic paint cause is cheap and I weren't shure of the results, but if you like it you can use fabric paint.
Step 1: WHAT YOU NEED
-sponge or rubber to make the stamps (mine is not really the better one but is what I found,is a kind of foam that don't absorb, I don't know the name; you can purchase some better kind);
-flat surface for pour paint;
Step 2: CUT SPONGE
Step 3: STICK SPOTS
Step 4: DaMPEN ROLLER
dampen roller in the paint .
Step 5: ROLL THE ROLLER
Step 6: DONE
I have to say that the first bag I made didn't come out so well, but you just need to get use to it, and try few times before do it on something you care about.
(when you are done using the pattern you make you can just remove the tape and you' ve got back your roller tape)