I made a diaper cake for one of my best friend's showers this past weekend and they are just so fun to make and great center pieces/gifts so I thought I would share... just in case you want to make one!
Start out with a round base (I used thick cardboard and covered it with felt) about 14 inches wide, roll 60-80 diapers (depending on the diaper size, I used about 80 of the infant size) and secure with a rubber band.
Place a bottle of some sort in the middle (I have used champagne, this is a bottle of baby shampoo) and put your first row of diapers around it, then rubber band that and do the same with the second and third row.
Add your second layer around the bottle, repeat the steps from the first layer, but you only need two rows (I like the picture on the diapers to show so it adds more color, but it's personal preference).
Add the top layer and it's just one row, you may want to use some clear double stick tape if the bottle is too short to help the top layer stay on.
Then the fun part, find some fun ribbon to tie around each layer and cover up the rubber bands, then add fun toys and baby necessities and a cake topper (I love the rubber duckies, but you could use a big bow or whatever you want). Enjoy!