I placed a Bunt cake carved out on one side for water fall on top of a small sheet cake. I used butter cream icing to cover both cakes and lots of it.I used the gel type cookie icing for water . The trees were made from rolled wafer cookies piped with leaves and the rocks were marshmallows rolled and formed into rock shapes rolled in cocoa. We just used a bag of plastic animals to accent. I also used a pack of Nemo" gummy treats for the turtles and fish. After finishing I wished I had used some tint in the white icing to make it look more like the ground and grass.