The type of diapers used is up to your preferene. I found that Pampers Swaddlers size 1-2 is mostly preferred. The choice of diapers you prefer does not effect the appearance of the cake.
Each diaper cake is made from scratch based on your preferencces and or theme. Cakes do depend on the availability of specific items.
All diaper cakes in my picture gallery are custom made to the customers preference. Basic diaper cakes can be made. A sample of a basic diaper cake will be coming soon to the photo gallery.