I googled star shape cakes and found the following articles on how-to:
http://books.google.com/books?id=evJxuG077M4C&pg=PA64&lpg=PA64&dq=cut+star+shape+cake&source=web&ots=OaUbOF1qn5&sig=6OKzdpgFgLK0B7N3RJm-TwZ68xU#PPA65,M1
This one is probably the most imformative....page 64 A star is born
http://books.google.com/books?id=V3f_zJVoOMsC&pg=PT107&lpg=PT107&dq=cut+star+shape+cake&source=web&ots=J-W4xOHrcV&sig=-QZMCRcCSs3JH-giKrfthK8xWXw#PPT108,M1
http://findarticles.com/p/articles/mi_qa3676/is_200012/ai_n8926164
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