A picture would help a lot. I'm assuming that you don't have enough of the fabric to make another row of blocks. You could add a strip of plain fabric in a coordinating color and put some appliqué on it. Or make a couple of rows of pieced blocks in coordinating fabric and add to the pillow end or a row on both ends. I'd set the new blocks on point, which means that you would need to unsew a bit. I guess I'm also assuming that it's not quilted yet....