Are you maybe looking for the traditional Giant Dahlia pattern?
There is a .pdf (you'll need Adobe Reader to see it) that includes templates here:
http://www.plumcreekquilts.com/Dahli...20Patterns.pdf
And then there is a very good book by Susan Aylsworth Murwin which I used to make one of these some years ago:
http://www.amazon.com/Quick-Dahlia-S.../dp/0486245012
Have fun with it Emily!