follow directions on boxed cake mix

use a 13 x 9 cake pan

let cake cool

mix green food colloring with white icing then add required amnts. to make brown until you get an olive green color

cover cake in icing

stick pretzel sticks next to eachother around the entire perimiter of the cake

crush oreos and chocolate graham crackers together in a bowl and sprinkle on cake to make a walkway. save some on side

use cake writing tools to write what you want on milano cookies and stick them in the cake like tombstones.

use remaining cracker and cookie bits to make a few graves look freshly dug

decorate cake with ghosts pumpkins candy corn worms and whatever else you can come up with to make your own unique graveyard