Pieced cookie "quilts" have been a favorite project of mine.
I've done them a multitude of ways.

Recently I stumbled across this fondant tool that works perfectly
to make stitch marks that emulate quilting.

Once you've decorated the "quilt blocks", allow them to dry for about two hours.

Using the " fondant quilter", press into the crusted glaze to give it a quilted look.

To make these patriotic themed quilt blocks take on a vintage tone, 

brush some black and/or ivory luster dust on them.