Preheat oven to 350ºF.

Prepare the cake mixes according to the box directions.

Split the batter equally into four bowls.

Add red gel food coloring to one bowl, creating a rich red color.  The amount of food coloring used will vary depending on the brand.

Add a small amount of pink gel food coloring to one bowl, creating a light pink color.

Add pink food coloring and a small amount of red to a third bowl, creating a medium pink color.

Finally, add pink and red to the last bowl, creating a dark pink color.

Note: You can always add more, but you can't take coloring out.  

Transfer each bowl of batter into a greased 8-inch round cake pan or 8x8-inch square cake pan.

Bake for 23-25 minutes or until a toothpick comes out clean.

Allow cakes to cool. 

Once cakes are cooled, crumble each cake, setting aside 2 tablespoons of each color for topping.

In a medium bowl, mix whipped cream cheese, sweetened condensed milk and Cool Whip until well combined.

To assemble trifle, alternate each color of cake with a layer of cream.

To finish, sprinkle remaining cake crumbs and Valentine sprinkles on top.

Refrigerate until ready to enjoy.