Prepare the paint
In every stamping crafts, you have to mix rubber (paint thicker) with textile paint. Be careful to give too much rubber, because if too thick, the paint will be difficult to applied well.
Use the sponge that tied become bundle to test the mixture. Check the mixture use the sponge in the blank paper until you get the good color.
Applied the paint
Take the paint with that sponge. Dab to the upper part of stamping tool. You can make your self this stamping tool with forming the sponge become your favorite shape.
Set the styrofoam to prevent the paint penetrates the back part of the pillow cover. Then cling and pressing the stamping tool that has dabbed with paint above the fabric.