A close friend of ours is getting ready to have a baby and I had a chance to make the diaper cake for her shower. The shower theme was ponds and ducks. I found this great little inflatable ducky on Amazon and used it as the base of the cake.
I didn't feel like making the standard round diaper cake because I'm not patient enough to wind a million rubber bands. I found this tutorial for making a square diaper cake and modified it to fit onto the duck. I used two Costco-sized boxes of size 1 Huggies...so a lot of diapers! I think it was approximately double the number the tutorial used.
My husband cut a piece of wood and screwed a dowel rod to it. This went through the four layers of the "cake" to hold the whole thing upright. It was a really nifty and easy solution.
The coordinating ribbons are just glued around the diapers (not to the diapers), they are just there to cover the rubber bands. The horizontal ribbons hold each layer of the cake together.
I picked up a few bath-themed items to tie to the cake along with a hooded towel for the duck.
This turned out great and only took a few hours to put together.