Celebrating a new family member also means celebrating the culture that the baby will be born into. Have fun playing up on Mom's and Dad's cultural backgrounds with food, décor, gifts and games. This is a great theme to use when the party is for the entire family, not just the mom-to-be.
An international-themed baby shower can be a great collaborative experience for the parents. Transform the party space into a Moroccan oasis, the Italian seaside or a French bistro. Talk to Mom about what aspects of her background she'd like to see represented at the shower. Make a CD with cultural music to set the theme and have a party!