Prepare your favorite batch of rice crispy treats. In a large saucepan, melt the butter over low heat. Add the marshmallows and stir until completely melted and smooth. Remove from heat and stir in the crisped rice cereal until fully coated.

Immediately press the warm mixture into two well-buttered 8 or 9-inch round cake pans. Press very firmly and evenly to create solid cake layers. Allow to cool slightly.

Carefully remove the cooled rice crispy treat cakes from the pans. Place one cake layer on your desired cake stand or serving platter. Optionally, spread a thin layer of vanilla frosting on top of the first layer, then carefully place the second cake layer on top.

Break the white Kit Kat bars into individual sticks. While the rice crispy cake is still slightly pliable, begin lining the edge of the entire cake with the Kit Kat sticks, pressing them gently into the sides to adhere.

Once the cake's perimeter is fully covered with Kit Kats, tie a large decorative ribbon securely around the cake to help hold all the Kit Kat sticks firmly in place.

Adjust any Kit Kats as needed, gently wiggling them closer together and adding a few extra sticks if there are any visible gaps.

Optional: Spread a layer of vanilla frosting over the entire top surface of the cake. This provides a 'glue' for your candy toppings and a contrasting white base.

Decorate the top of the cake by filling it with an assortment of your favorite candies. Arrange rock candy, lollipops, Runts, Sour Patch Kids, Nerds Gummy Clusters, gumballs, and shaped marshmallows creatively until the top is fully covered.

Serve the candy cake immediately for the best texture, or store it in an airtight container at room temperature for up to 2 days. Enjoy your colorful and fun creation!