I watched Billie Lauder on QuiltersTV make blocks using 5 1/2 charms.
She first made a 4 patch then with a ruler cut 1 1/2 inch from center seam on both sides. Then she sewed them back togather with the fabrics not matching togather. Then she cut again from the center seam and put them togather again. what was great is no pins the seams just fit togather perfect. The block was great.
I ordered the book for that and other patterns from Connecting Threads since they have a book sale going on. So it was less than $12.
The book is called Quick Tricks Squared. The video is 16 plus on Quilters TV.