I found a pattern in a couple old 1980's Quilt magazines, and it seems to work ok (with a little adjustment). And it's pretty much identical to the one in a book I just bought: Quick and Easy Giant Dahlia Quilt on the Sewing Machine by Susan Aylsworth Murwin and Suzzy Chalfant Payne. I did not assemble it according to the directions in that book -I sewed it in quarters, then in halves and then together. If you do a google search for "giant dahlia quilt pattern", you will find a few different patterns.