For Gloria's 8th birthday she wanted to have a Barbie 3 Musketeers party. It was tougher than we thought it would be simply because we couldn't find a store that sold any Barbie birthday decorations. We thought that would be a classic, but it wasn't.
Since there is a masked ball in the Barbie movie, we told all her guests to come in costumes with masks. One kid's mom went all out on his costume. We were very impressed. There's also a hot air balloon in the movie that the prince flies in, so we made her cake in the shape of a hot air balloon. She loved it.