That probably sounds very easy, but I beg to differ. It is VERY messy and very difficult to do. When I would move the paint where I wanted it in one area, another area was destroyed! I have the utmost respect for artists, like Kimberly Conrad, who do this routinely.
I usually end up tossing these out, or try to use them as an under painting, as the seldom feel like successful pieces to me. It has been some time since I tried this....I think I am ready to give it another try,