Splatt painting is like the extreme sport of painting for preschoolers.
What you will need
large sheets of paper
a firm base beneath the paper (if you are doing this on grass) - we used a pallet
bowls for the paint
home made bean bags*
(* To make our bean bags we simply wrapped sand in material scraps and tied up the top. You could also use beans or marbles or anything heavy enough to give a satisfying "splat". Putting the materials in old stocking feet also works well.)
Find a place where you are able to make a big mess or a place where you can spread plastic tarps, old sheets, and/or old shower curtains.
Pour paint into the bowls
Dip the bean bag into the paint
climb to the top of the ladder
Guaranteed to attract the interest of the "boys who don't paint" crowd!