More to explore:
Nautical diaper cake
centerpieces for baby shower boy whales | Brookie's Baby Bargains: Make Your Own - Baby Shower
Diaper Cake covert this into a bridal ,,cake using dish towels
SALE 15 Off Sweet 3 Tier Diaper Cake DuoTM by BabySweetTreats
make the most awesome Mario-themed diaper cake, to match the recipient's baby room decor.
Items similar to Three Tier Modern Baby Our Lil' Sunshine Rainbow Diaper Cake Baby Shower Centerpiece on Etsy
Turtle Pond Diaper Cake Centerpiece - could do something like this with burlap and ribbon to match decor, the colors are great
Not sure what is a good price for these things, but you might be able to make your own with this as inspiration. It's basically just ribbon and stuff.
Diaper Cake for shower gift!
yellow and gray party decorations | Request a custom order and have something made just for you.