For an end of the school year picnic for our homeschool group called "Smile." All buttercream. The cake is white cake colored in 4 different colors and swirled together. For the tie dye I crumb coated the cake in yellow then started with the purple and made a curvy line. I went back around the purple with pink, then green then blue then filled in any gaps with whatever I had the most icing left. I really like this cake. 1/2 shet cake saize with 8 inch dome cake for the smiley face.