Having made just one block, my project was destined to remain relatively small. Surrounded by more background fabric (a gray chambray), I was aiming for a 12" x 24" pillow insert. For quilting, I tried another something I've been wanting to try - a diamond crosshatch, with lines about 3/8" apart. What fine texture it creates.
[Random note: after finishing the pillow, I happened upon made by ChrissieD's Quilted Pillow Cushion with Hidden Zipper, which has a zipper installation that's very very similar, except with 1/4" double-stick fusible tape....a clever idea I'd like to try.]