I don't think I would try using the scarves in a quilt. I don't think that they would hold up to use and washings. I don't know exactly what your scarves are made up of but my daughter brought home several types of scarves when she served in Afghanistan a couple years ago, none of them were something I would consider using in a quilt. Maybe someone else will be of some help on this one.
By the way, welcome to the board from Southern California!!