After you have stacked your diapers take your blue border (this border is commonly used for science project and predestination boards) and start at the top of the bottom layer and work your way down to the floor to give the water effect. Try to have all the ends meet in the same general area to keep it from looking sloppy.
I bought some animals at hobby lobby for $.67 - $.99 cents.
Add some leaves that somewhat cascade or whatever you prefer.
I will later add personal items such as lotions, more shampoo, powder, etc.