We have a family tradition that I bake custom birthday cakes for the boys. They are usually odd, and frequently amateur, but always fun. This year I made a "Central America" cake in honor of our upcoming trip to Honduras. I baked a sheet cake of chocolate and another of white cake with blue food coloring added. Then I cut them into the shape of Central America, along with some of Mexico, the Yucatan Peninsula, and the northern bit of South America. I used blue cake for water, and brown cake for land. Here is what it looked like before I added frosting.
Then I frosted the land with chocolate, and frosted the water with lemon frosting with blue food coloring. The frosting can cover up the disjoint sections of water, and gives it a certain wave-like quality. Do you see the Panama Canal?