I grabbed a couple of round sponge applicators from the tshirt/fabric paint aisle at Joann's and filled a small palette with white acrylic paint. Noodle was able to dip the sponge applicator in the paint and make a circle on the pots. You will see that the paint dripped sometimes. It helps for your paint to be really thick.
Once the pots were done, Noodle and Daddy filled the bottom pot with soil and placed the smaller pot on top. Then they filled the edges with flowers and the top pot with flowers. It is a little bit of a Leaning Tower of Pisa flower pot but Grandma loved it.