(Haven't tried it, but thought this might be a fun treat for kids & adults. It could be made SBD-friendly, by taking out the watermelon, using another cereal, and altering the yogurt.)

4 cups corn flakes
2 cups fresh blueberries or sliced strawberries
2 cups minced watermelon
2 cups low fat vanilla yogurt

Layer 1/3 of the corn flakes evenly in bottom of 8 x 8 inch serving dish. Mix together fruit & yogurt; spoon half of fruit mixture evenly over corn flakes. Sprinkle half of remaining flakes over fruit mixture; top with remaining fruit mixture. Finish with layer of corn flakes.