Cake One
Bake one circle and one square. Cut the circle in half. Put the pieces together as shown below.
Frost and decorate as desired.
A Sea Monster
Bake four circles. Cut as shown in the picture below. Leave one interior circle for the head. Eat the rest for a snack.
Cover a very large piece of cardboard with aluminum foil. Frost with blue icing. Frost all the pieces with a layer of frosting to set the crumbs. Set the pieces upright as show below.
Frost and decorate as desired. If you are expecting a lot of people, put two layers of sea monster together.