I used a 5-sided center piece (red)and sewed it to a 12"x12" cotton square. I sewed a piece, right sides together, to one side of the red center and flipped it over and pressed it. This method of stitch and flip is explained in an instruction booklet #309 Flip Quilt at http://catsongstitchery.etsy.com This method is repeated with larger fabric pieces until the whole square is covered in fabric. The wrong side is shown above.
Then, after pressing the whole block flat, and trimming any extra fabric off the sides, I used some decorative machine stitches on each seam. Back it and bind it. I used 4- 12" blocks to make this table runner that is 12"x45". Loads of fun to sew! The finished runner is in my shop- http://catsongstitchery.etsy.com