Your choice of cracker (like Ritz)
Orange cheese, preferably already sliced
A contrasting layer (Like white cheese slices)
Cut the slices of cheese into cracker-sized squares.
Cut the orange cheese into jack-o-lantern shapes by hand, or use a miniature cookie cutter if you're lucky enough to have one.
Lay the contrasting layer on the cracker, then top with the jack-o-lantern slice.