Prepare cake mix according to package directions, except replace the water with an equal amount of rose and mix in a few drops of red food coloring. Pour batter into prepared pans, spreading evenly. Bake according to package directions. Cool in pans on wire racks for 10 minutes. Remove from pans; cool completely on racks.
In a large bowl, mix the frosting, the seeds of one vanilla bean, and a few drops of blue food coloring. Place one cake layer, bottom side up, on a serving plate. Spread with about 1/3 cup of the tinted frosting. Repeat with two other cake layers. Frost top and sides of cake with remaining frosting. Garnish with raspberries.