Using white cake mix, make batter as directed. Use several plastic (or glass) cups, pouring white batter in them, divide between all cups. Add food coloring to each cup for the colors desired. Mix each cup and then put a little of each color in each muffin cup in small blobs. Then drizzle other colors over the blobs. Bake as directed.
Banana Bread: uses honey and applesauce instead of sugar and oil