I pinned a big piece of paper to our outside fence today and blobbed out some washable paint for the kids. I gave them paint brushes~ silly me. After 30 seconds they started using their hands and I'll admit, it looked like way more fun. With this kind of project it doesn't matter what the end result is, letting them feel the movement of paint and the mixing of colors is such an important lesson for them to learn.
Had to stick them in the shower after this adventure!