Use green or purple food coloring to tint some vanilla icing. Frost the brownie or cookie with the tinted icing. Use mini wafers or cut one large marshmallow in half for eyeballs.
Place the eyeballs on the brownie or cookie as shown in the photo. Use icing to attach jelly beans or red hots for the pupils. Use a gumball or Ju Jube for the nose. Cut a piece of lace candy for the mouth; press it into a frown and add candy corn teeth if desired.
To make eyebrows, place some black food coloring paste and few drops of water into a small sealable container, stir to mix. Add coconut, seal the container, and toss to color the coconut. Completely cover two pretzel sticks with chocolate icing. Immediately roll the pretzels in the tinted coconut. Use icing to attach the eyebrows.