You will need:
Paint or draw zig-zag hair on the top of the green egg box.
Cut out two rectangles of paper or card and stick on to the green holder as a mouth and eye brows.
Stick on googly eyes and stack your 3 egg holders on top of each other with a spacer in-between (you can use glue to make the models more durable - I recommend an adult use a hot glue gun if available as PVA isn't particularly sticky on these cartons).
Well done - Your Frankensteins monster egg boxes are complete... How about trying some of the other Halloween egg box crafts following these tutorials...
To complete the spooky halloween look, why not decorate your house with this egg box crafted bat and ghost bunting.