Make the white cake mix according to the box
Make the strawberry cake mix according to the box
Divide the batter into four bowls
Add blue gel food coloring to one
Add purple gel food coloring to the second and
Add green gel food coloring to the third bowl.
Leaving the fourth bowl white cake batter
Leave the strawberry batter the way it is
Spray the bundt pan with Pam spray.
Begin by spooning in the white batter then the purple next then the green batter, then the blue batter on around the pan.
Fill the top of the colors with the strawberry batter and take a knife and pull through to barely mix it up.
Bake the cake at 350 degrees for 30-35 minutes or until an inserted toothpick comes out clean.
Allow the cake to cool in the pan for about 20 minutes then remove the cakefrom the Bundt pan and place on a wire rack until completely cooled.
Combine all ingredients, except the colors and sprinkles and sixlets, into a standing mixer and beat until stiff peaks form.
Add the extra half cup of powder sugar if the royal icing looks like soup
once stiff peaks form split into 5 bowls
add the colors into the bowls, mix until you have your desired color, leaving one bowl white
drizzle the colors onto the cake with a spoon
add the sprinkles and then the sixlets