Take each wooden skewer and slide blueberries on to the pointy end, pushing them gently up toward the middle. Repeat this process until you have as many on there as you'd like, leaving about 2-3 inches for the watermelon star.Cut your watermelon into slices. Use a cookie cutter (the metal ones work really well in watermelon) to cut out star shapes from each slice. Slide a star on to the top of the blueberries on each skewer.Cut any remaining watermelon into cubes for munching!