Preheat the oven to 350°F (175°C). Grease and flour the cake pans.

In a mixing bowl, cream together the butter and sugar until light and fluffy.

Add the eggs one at a time, mixing well after each addition. Stir in the vanilla.

In another bowl, combine the flour, baking powder, and milk. Gradually add to the creamed mixture.

Divide the batter into three bowls. Add varying amounts of purple food coloring to each bowl to create an ombre effect.

Pour the batter into the prepared pans, starting with the darkest color and layering up to the lightest.

Bake for 20-25 minutes or until a toothpick inserted into the center comes out clean.

In a mixing bowl, beat together the cream cheese and butter until smooth.

Gradually add the powdered sugar and mix until well combined.

Stir in the vanilla and milk until the frosting reaches the desired consistency.

Once the cakes are cool, frost each layer with the cream cheese frosting.

Stack the layers from darkest to lightest, creating the ombre effect.

Decorate the top as desired and serve.