Moira, to my eye, that collection doesn't go together. Maybe it's just the lighting or my screen, but I see two different quilts because of the colorways--a purple one and a turquoise one. (Normally I love these colors together, but the fabrics you have are busy.) The white print would work better, IMO, with the turquoise, but better as a backing.
If it were me wanting to do a quick and easy donation quilt, I would choose one of the colorways and find a solid or tonal. For the turquoise, a coral blender. For the purple, white. I'd make a strip quilt with alternating squares, like so:
https://www.etsy.com/listing/2313117...t-baby-blanket
Ideally you could make two of the same if you cut them simulataneosly and have enough fabric.