If you're short on time or prefer a simpler approach, there are plenty of easy ways to decorate your Halloween cake. You can use themed cake toppers, edible decorations like sprinkles or candy eyeballs, or even create a spooky design using stencils and powdered sugar. Another quick and impressive option is a spiderweb design. Simply drizzle black icing in a spiral pattern on top of a white or orange cake and use a toothpick to create a web-like effect.