Lego Nexo Knights Book of Monsters cake | use image of book of monsters Lego piece as reference. Frost cake with chocolate frosting - smooth top. Sketch face & details into the frosting w/ toothpick. Mix frosting colors (light +/or dark chocolate, red, yellow, black) or buy colors (Wilton makes black and other colored frosting). Pipe in details. White gel works great to create jagged teeth! Globlins are candy melt dipped Rice Krispie treats rolled into balls and detailed.