I have made 2 memorial quilts for families whose teenagers have died tragically. It seems the design just clicks when I see something appropriate. I used fabric from a uniform skirt in one quilt, but don't have the experience of using many different fabrics. I'm sure something will come to you. It is a very rewarding experience to create a lasting tribute to the families.
Here's one of the memorial quilts. I used some pictures that I received from one of the teen's grandmother. I presented the quilt to them last weekend and they were very touched.