Not sure if this will help you as its a book preview from online. Theres a collar template on pg 287, its a full color, but you'll need to click on the page arrows at the top until you reach that numbered page.
I strongly suggest like the others, that you find a book on royal icing and runouts though. They'd be a lot more helpful for the measuring that needed, whereas links don't always provide that stuff.
http://books.google.ca/books?id=ld1Q0pkg6s8C&pg=PA224&lpg=PA224&dq=royal+icing+collar+templates&source=bl&ots=URhO24Hxjs&sig=JDWiYDZbKWfjkXKw0-_5n-GDiOo&hl=en&ei=GHqjTcfbK46ssAP51cT6DA&sa=X&oi=book_result&ct=result&resnum=3&sqi=2&ved=0CCcQ6AEwAg#v=onepage&q=royal%20icing%20collar%20templates&f=false
I've actually taken out a few books from the library that had collar templates in the back. I found one on Amazon that you might be able to refer to
http://books.google.com/books?id=Z2gy-JXou3wC&pg=PA172&dq=runout+collar&hl=en&ei=ioGjTYGXMorA0QHlx5SjBQ&sa=X&oi=book_result&ct=result&resnum=3&ved=0CDIQ6AEwAg#v=onepage&q=runout%20collar&f=false
HTH
There are several ways to do templates - you can buy a royal icing book - I would recommend Eddie Spence's book- He is the undisputed king of Royal Icing (and my tutor) or there are other books - an old one is called Confectionery Design by Lindsay John Bradshaw
photo copy the designs and scale them up to the size of the cake - remember that they will need to actually rest on the cake so the inside edge should be abvout half an inch smaller than the royal iced cake
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