McCall's has a template pattern. The only problem is that to print it out you have to have legal size paper. I took two sheets of paper and taped them together times 4 I believe it has 4 pages of instructions. I 'll continue to surf and find another.
http://www.mccallsquilting.com/legacy/vintage02_pattern//index.html
Found another one.
http://www.freespiritfabric.com/graphic-elements/gallerys/t97_1.pdf?PHPSESSID=bccdf81b0e1aaa13e489f9ed0a1a6e cf&PHPSESSID=bccdf81b0e1aaa13e489f9ed0a1a6ecf
This one has a 30 minute video. Very informative.
http://www.brightcove.com/title.jsp?title=958525358&channel=156457828
This site you can order templates or print a picture of them and then blow them up. I don't know if this distorts the pattern or not but it's worth a try.
http://www.brightcove.com/title.jsp?title=958525358&channel=156457828