When it comes to icing and cakes, children often like bright colors and shapes, such as cakes shaped like rainbows, animals and favorite characters. Using neon green frosting is a way to have fun with cake or cupcake decorating and will surely delight your child. Neon green icing can also be used to decorate a sports team-themed cake for teenagers and adults. Such frosting is simple to make using liquid food coloring and white frosting, which you can either purchase or make yourself.
Place a container (or less depending on needs) of white frosting into a mixing bowl.
Add one drop of green food coloring and three drops of yellow food coloring to the bowl. Mix well.
Add more yellow food coloring if necessary to make the frosting brighter. Use more green frosting if necessary for an even color -- experiment to find out what works for you, though you probably will not have to add more coloring.