Just found this:
http://quilterscornerclub.tripod.com..._patterns.html

I had no idea there were so many variations. Anyway, as others have said, enlarging a 6" pattern 200% will do the trick. The problem will be that on a home printer, that's bigger than your page. It might print out in a way that you can then tape together, or a copy shop might be able to print it on larger paper for you.