Cake: Israelites through the Red Sea

I made this cake a while back for the Friday play group. The story for the day was the parting of the Red Sea and voila! a very easy cake.

The cake is one large round cake baked in a 22cm cake pan (cake rose to the top). This can also be done with two normal sized cakes that you would layer to get the required height.
I first put a layer of icing glaze (icing sugar mixed with water) along where the middle would be and then positioned the two halves of the cake on both sides.
The inside edges of each side was cut down with a knife. It was iced with blue-colored butter icing and some icing glazed was used to pipe along the ridges to simulate waves. I crushed some biscuits and sprinkled them on the glaze in the open area for 'sand'. Little jelly-babies made up the 'Israelites'. And just for something extra for the kids I lined up marshmallow fish around the outside.