I took 16 vintage sheet fat quarters. I had a bunch of vintage sheets but I also bought some fat quarters on Etsy. The fat quarters measure 18 x 22. For each fat quarter I cut it in half so you have two 11 x 18 pieces. Then I cut one of the halves in half so you end up with one 11 x 18 and two 11 x 9 pieces.
After you have everything cut, lay out your pieces in a random pattern. I counted the larger 11 x 18 pieces as two so my finished quilt was 8 pieces long (the 11" side) x 7 pieces wide (the 9" side)
I used another vintage sheet as the backing and to "quilt" it I used knotted yarn in the center of each piece (and two pieces of yarn for the larger 11 x 18 pieces.)