Maybe search online and find the exact room decor the new parents are planning to use. There will be coordinates available of all kinds. Copy one of those for ideas for her quilt.
Words of warning: Many parents these days are particular as to the style of their nursery. If something doesn't go with their theme, they will not use it even in the car or another room.
Save your friend some heartache and have her work with the parents on this. Trust me.