Aside from the memory that your mother cherished it on her bed, are there other memories in that small pillow? Are the scraps from your sewing scraps from other projects? I have found that controlled (matching or coordinated) colors do not make a cathedral window as wonderful as random beautiful colors. All those colors just make it want to glow like stained glass with sunlight coming through.
My grandmother made a cathedral window quilt for each granddaughter. It is fun to get mine out and look for scraps that were from dresses that my sister and I wore, or an apron my mother wore, or a maternity top for a new baby to be. Such fun to remember....
Thanks for sharing your treasure.