Soon after the disasters associated with 9-11, many quilters turned to their needlework for solace for themselves and to bring comfort to others.  They also have used quilting, fabric art and mixed media to commemorate family members,  friends, and other heroes of that fateful day.
Here are a couple of sites you may want to check out to learn more about some of this art.
9-11 Memorial Quilts
World Trade Center Quilt