For tombstone cookies, tint dough gray. Roll out and cut shapes using tombstone cookie cutter; bake and cool.
Bake and cool cupcakes in baking cups. Ice smooth; sprinkle violet cupcakes with violet sugar. Pipe tip 3 outline spider web on green cupcakes. Pipe tip 3 dot and outline skeleton arms and hands on orange cupcakes. Print "RIP" with tip 3 on tombstone cookies. Insert ring toppers and cookies in cupcakes. Position cupcakes on stand.
*Combine Leaf Green and Lemon Yellow for light and dark green shades shown. Combine Violet and Pink for violet shade shown. Add a little Black color to white icing for gray shade shown.