Slice ends off of watermelon and remove shell from remaining section. Set on cake stand. Arrange individual grapes around base of "cake." Attach kiwi slices to sides using toothpicks. On top of melon, shape strawberries into a star, piling blueberries in the center.
Recipe by Rachel Schultz at https://rachelschultz.com/2013/07/14/cake-made-of-fruit/