I made this Tombstone birthday cake for my dad’s surprise 50th birthday. It was really easy.  I just made a boxed cake in a 13×9 pan and cut it out in the shape or a tombstone.  It was very easy to decorate as well.  Just frosted the cake with colored frosting grey, then piped in the green, and made the black spiders, webs and cracks with a small piping tip.