I agree that a quilter would be happy to advise you or even assist you. But, before you talk to them, do some planning. Lay the quilts out on the floor, move them around until you find a pleasing arrangement. Lay some different colored things in between to get an idea of a color for the sashing. Use a sheet or even an article of clothing laying under the edges to give you an idea for colors. Use your phone and take a couple pictures. Then, when you speak to someone, you will have pictures and measurements to help them help you.