Carefully arrange the toppings in rainbow order on top of the smoothie base. Begin with the red fruits (strawberries, pomegranate seeds), followed by the orange fruits (sliced mango, mandarin segments), then the yellow fruits (banana slices, pineapple chunks), the green fruits (kiwi slices, green grapes), the blue fruits (blueberries), and finally the purple fruits (blackberries, purple grapes).