Ask the Guests
In the invitation, ask everyone to bring something small for a "bath theme". These items can be placed in a large decorated basket or baby bath tub for mommy to use after the baby is born. The items can include ducky design baby towels, sponges and more. Ask the guests to be creative and give a prize to the person that brings the most unusual and usable small gift.
Send each guest a rubber ducky and ask them to bring it back ready to tell a story about the mommy-to-be or the daddy-to-be. Encourage guests to clothe or decorate their ducky and give a prize for the prettiest, funniest, and silliest. The decorated rubber ducks will add a fun touch to the baby's nursery. Remember to ask guests to sign their name and date on the bottom of their ducky.
Send the invitation inside a plastic shower cap.