Paint, paper or pottery
This is a great craft for a grandparent gift or a class project. Begin by gathering several colors of paint. Then take each child's thumb, press it lightly into the paint, and then press it onto the paper or object. This will be the center of the flower. Then, using a different color of paint, press thumbprints around the first one, creating flower petals. Make one flower for each child -- or several from one child. This can be done on paper for fun or a piece of pottery to have forever.