This hero dad has created a life-sized Yoda cake for his son's fourth birthday (though I suspect also for himself). He has very kindly posted installments of this mammoth bake online.
I am not sure what percentage of Star Wars-themed kids' birthday parties are more influenced by the parents than the children, but I suspect it is fairly high.
Implications - Star Wars is a huge phenomenon that has been around for years. People have bcreated many Star Wars-themed items for show their love and appreciation for the films. Since Star Wars has such a huge following, products and services related to this large cultural phenomenon tend to go viral once they hit the web. This sort of free marketing can go a long way.