I found this idea for painting with balls, and Love Bug was very excited by it.
We took an old diaper box, lined the inside with paper, picked out a few different types of balls, and then rolled the balls in paint. The plan was to have the box set upright so that he could throw the balls into it (for a good gross motor activity, too), but he just wanted it laying down so that he could drop the balls in (so I guess it was more Ball Drop Painting).
We also shook the box around to make the paint go all over. The only bad thing with doing it this way was that most of the paint stayed just on the bottom paper, so we didn’t end up with a couple finished products to give away to family.