I took a class from George Siciliano and did one of his minis. Finished at 15" square. Love his techniques because he prints his foundation on a very light stabilizer that can go thru the printer. Then it stays in and no stretch bias edges - and there are lots in his patterns. But I've used the stabilizer technique for other foundation quilts and it is wonderful, especially because you don't have to tear out all that paper.
check out his sign
http://www.georgesiciliano.com/
When I heard his lecture he said he kept getting smaller because that way the quilt fit under his machine. Note, his wife Virginia is a magnificent hand quilter.