Spoon 1/4 cup yoghurt into each of four 3/4 cup-capacity plastic containers. Sprinkle each with 2 teaspoons Milo. Divide remaining yoghurt between containers. Using a skewer, lightly swirl Milo through yoghurt. Seal containers. Refrigerate.
Cut pineapple into 3cm cubes. Using a melon baller, scoop 24 balls from rockmelon. Thread pineapple, melon and strawberries onto skewers. Layer skewers in an airtight container. Refrigerate.