Make your own diaper invitation.
Cut out triangles from pink or blue construction paper. Or cute a piece of paper into a square, fold it in half to make a triangle. Write the diaper's party invitation wording on one side of the triangle and fold the bottom corner up and then the sides to create a diaper.
Then add a baby diaper pin, which you can purchase at any baby store, to hold the triangles.
You can invite each guest to bring a package of disposable diapers to the diaper's party. Don't forget to assign a diaper size for each guest on the baby shower invitation.
Here is a diaper party invitation verse you can use.
"To add a little extra glee
and help the parents-to-be,
Please bring a little extra
from the heart.
An unwrapped pack of diapers ( ___ size),
To give them a good start!"
or here is another sample, you can change the names to your own:
The changing table and diaper bag have something that they share,
When you reach inside of each - a diaper should be there!
Since Mary and Joe are parents-to-be and will be doing alot of "changes",
Please join us as we shower them with diapers - in all of the size ranges!