Preheat the oven to 350 degrees. In a mixing bowl, combine the brownie mix with the eggs, vegetable oil, and water until smooth.
Pour the batter into a greased 8x8 baking pan and bake for 25 to 30 minutes until a toothpick comes out with a few moist crumbs.
Remove the pan from the oven and let the brownies cool completely on a wire rack.
Cut the cooled brownies into 12 small squares.
Spread a thin layer of green frosting over the top of each square.
Press two candy eyeballs onto the frosting of each bite. Use the black decorating gel to draw a mouth and hairline.
Break each pretzel stick in half and gently push two pieces into the sides of each brownie bite to form bolts.