Here is a 40th birthday cake I did for my former boss's husband. She definitely wanted something with a black "turning 40" theme so after doing some research I came up with the black and gray stripe design with a burial plat signifying the "death of his youth". He loved it!
The cake itself is a yellow cake with vanilla buttercream (colored black), covered in gray fondant with black fondant stripes. The stones, "40", rose and tombstone are fondant, the dirt is crushed chocolate cookie crumbs and the grass and bottom border are buttercream.