#1. Marshmallow ghosts aka why didn't I think of this before

#2. Spooky candy bar
#3. Spiderweb dip- add sour cream on top of guacamole for the web by starting in the center & drawing lines out to each edge. Then create the 'web' by drawing lines in a outward facing curve from line to line. Finally, use knife to smooth down original lines from center out to the edges. Piping the sour cream would work best.