One of my favorites is The French Country party. It was a yellow and grey color scheme that turned out beautifully. It was for a 3 year old who loved the color yellow, tutu's and her parents were in Paris when she was conceived.
The invitations were the Eiffel Tower with a vellum overlay, party favors were small linen bags with the Eiffel Tower filled with French candies. It was a tea sandwich, croissants and finger food spread along with handmade candies and treats. The birthday girl even had a custom shirt and tutu made for her big day!
The elegance and simplicity of it was beautiful and can easily be adapted for any color scheme or tea party.