Share a little about the materials, processes, and techniques used to create this cake White cake, food colouring, white cupcake liners, vanilla frosting, rainbow sprinkles. What are you most proud of? How nice the colors came out. What advice would you give someone starting this project? I used 6 different colours: red, orange, yellow, green, blue, and violet. When filling the liners, use approximately 1 teaspoon per colour. To even the colours out, carefully shake the muffin tin horizontally after each spoonful.