I made this toilet cake for my brother-in-law and nephew for their shared 60th and 40th birthday surprise party. I purchased a Wilton Horseshoe cake pan for the toilet seat.
I used two white cake mixes and had to make two separate cakes, then put one on top of the other to make it higher. They were then frosted with White Fluffy Sugar frosting. The toilet lid is made out of cardboard, which I spray painted white and reinforced with heavier cardboard (stapled) on the base in front and back to make it stand up alone.
The cake is on another separate piece of cardboard covered in white freezer paper not attached to the toilet lid so I could transport it to the party. The “waste” inside the toilet is a semi-melted Baby Ruth Candy Bar.