Hello Buffy and happy birthday to your girls! What a magical and memorable way to celebrate such an important milestone! Lunch at Cinderella Castle sounds perfect, and the Castmembers there love to spread pixie dust around.
For special custom cakes you can call the Disney cake line at 407-827-2253. They will guide you through choices, give you ideas and, of course, answer your pricing questions. I'm sorry I don't have pictures of cakes to post for you, but you can visit
www.disneyworld.disney.go.com/celebrations to look at one of the Princess cakes that they offer. They will need a few days advance notice. Another way to create a magical moment for your girls is to call a Disney Floral & Gifts Dream Maker at 407-827-3505, or go online to
www.Disneyflorist.com. They can create a personalized celebration or put together an "In Room Celebration". I don't think anyone will forget that!
Again, please wish your girls a very happy birthday from me!