Preheat oven to 350 degrees F.
Mix cake mix as directed on the box. Separate about 1/3 cup into three bowls. This is for the the coloring.
In each bowl drop two drops of food gel. Stir well.
Line baking loaf pan with parchment paper. Fill with white cake mix. Drop in other colors of the cake mix. Then do a figure eight to mix the colors on top.
Bake for 45 minutes until a toothpick inserted comes out clean. Let cool on a rack for 1 hour.
Use icing to ice the top of the cake loaf. Top with cinnamon. Slice and serve for mardi gras fun!