Prepare the cake according to instructions, in a 9x13 pan. Cool completely.
In a stand up mixer, beat cream cheese and butter for about 2 minutes on medium speed, until light and smooth. Beat in hot fudge topping, vanilla and powder sugar starting on slow and then raise the speed to medium and beat until all incorporated.
Cut the cake in 3 even rectangles. Stack them together and trim the sides so they are even. Save all the scraps!
Frost the cake in between the layers and all over the sides and top.
Start stacking the wafers, upright, like a fence, all around the sides of the cake. Depending on the height of your cake, you may need to trim the wafers. Use a serrated knife to do that. Press them onto the frosting, lightly.
Crumble the cake scraps and sprinkle over the top to create the "dirt."
Melt the candy melts in the microwave for a minute, on half the power and stir well. Dip the cookies in the yellow melted candy and place them on parchment paper to harden. Drop a candy ball in the center of each flower cookie.
Drip some food coloring on the cotton ball. Rub the skewers with the food coloring. Cut the skewers down if they are too long.
Place the cookies on top of the skewer but not all the way through. (Don't press too hard.)