Bake and cool cake. Ice eyes, nose and inside mouth smooth with black icing (smooth with finger dipped in cornstarch). Cover remainder of cake tip 16 white icing stars. Use tip 4 and green icing to pipe spider's body and legs. Use tip 3 and white icing to pipe teeth (smooth with finger dipped in cornstarch).
*Combine Leaf Green and Lemon Yellow for green shown.