I copied this one from the invitation.
I use a chocolate icing for the background so I don’t need a lot of black color. (Black color makes the icing taste bitter.) I use a big round tip for the ball, putting the two colors in and then rubbing it to make the marble effect. The pins are also done in a large tip, with a smaller round tip used to outline them. I think that dots and the name in many different colors really brighten up the cake.