http://cakecentral.com/modules.php?name=gallery&file=displayimage&pid=1196371
http://cakecentral.com/modules.php?name=gallery&file=displayimage&pid=40748
These are the templates I have saved, not sure its what you need... Good luck.
Also, you can google a picture of a crown/tiara and trace it onto wax paper or parchment paper. That's what I did for the tiara on the wedding cake I made for class.
There is an article on the home page about how to make a royal icing tiara.
I just make sure it is the size that I need to fit on top of a 5" round. I use a small round oatmeal container. That makes sure it comes out the right size.
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