Decorate a birthday cake exactly as you like with food colouring pens. Write a name, draw festive balloons, or if you really have skills, you can draw your favourite fairytale character. Cover the cake with white sugarpaste and go wild with the food colouring pens. Just remember not to rest your hand on the cake, because it can leave a mark and ruin your beautiful designs! The little balls along the cake are rolled from sugarpaste and placed around the cake with edible glue. The pens contain edible sugar.