You CAN do all 3 if you really want to. But I recommend choosing only 1 sponge because having both chocolate and lemon sponge together will be too busy. If you go with lemon sponge then definitely add sprinkles into the batter to make confetti in the baked cake. Then when you cut into the cake SURPRISE you get a wonderful assortment of candy. You can even use lemon candies inside the mix for a tie in. Elegant on the outside. Fiesta on the inside.