Lulu got a playdough (or claydough as she calls it) extruder for Christmas. It entertains her for long stretches of time. I am amazed. Here is some of her work.
Notice that I limit Lulu to colors that make other colors. When using clay or paint I try to limit her palette so she will discover what happens when you mix primary colors together. If you give them too many colors they end up making mud. Even very young children know when something turns from beautiful bright colors to yucky greenish brown. They get frustrated. So limit them to 2-3 colors for now.