reheat the oven to 350 degrees and spray the 3 cake pans with pam baking spray
Combine all cake ingredients into a standing mixer or large mixing bowl and beat until combined
Divide the batter between 5 medium bowls
Mix in a few drops of one color into 1 bowl and mix until combined
Repeat with remaining colors
Drop dollops of the colors into the three cake pans
Bake in the oven for 25-32 minutes or until a toothpick comes out clean
Allow to cool completely before moving onto the cake board
Using a cake leveler, remove the dome from the cakes to make even
Using a standing mixer, beat together the butter, powdered sugar,
vanilla, and heavy whipping cream until combined, smooth and stiff with peaks
Scoop 1/2 C of frosting into 6 bowls
Mix in a few drops of a color into 1 bowl. Repeat steps for remaining colors
Building the cake directions
Using 1 cake layer on the cake board, scoop 1 C of frosting onto the top of the cake and spread evenly
Place the second layer of cake on top of the first layer of frosting.
Scoop another 1 C of frosting onto the second layer of cake and spread evenly.
Place the last layer of cake on top
Frost entire cake with the remaining white frosting
Scoop ¼ C of each colored frosting into their own bags, set aside
Using a knife, blot dollops of the colored frosting all over the side of the cake
Take a flat spatula and lightly spread the colored frosting to create a rainbow effect
Using the colored frosting, pipe dollops of the frosting on top
Place the flowers randomly throughout the cake
Using the black piping bag, pipe peace signs randomly onto the sides and top of the cake
Cut and enjoy!