Since the fabrics are of many different shades and blend nicely, my first thought is to expand her selection and make a bargello or French braid quilt. Both require "color runs" of more than 6 fabrics, but she's provided a wonderful base.
What I love about both bargello and French braid patterns is that the color runs "go somewhere." They don't just muddle among themselves, however harmonious that might be.
Good luck! And please let us all know the outcome!!!