Mix cake according to manufacturer’s instructions. Measure out 3 pounds batter, deposit 1 pound into a sprayed and papered 8-inch cake pan. Repeat two times to make 3 cakes total. Bake at 350F until cake springs back lightly when touched. Let cool completely. Fill, crumb coat, and smooth ice cake with palest blue buttercreme. Mix together 1 part black buttercreme and 2 parts grain alcohol or vodka. Place a toothbrush into the mixture and gently “spray” the cake. Repeat as necessary to make speckles. Let speckles dry then decorate with toasted coconut and robin’s egg candies.