There is an area in Montmartre near Sacre Coeur that is the center for designer fabrics. There are more than a dozen shops selling fabrics of all kinds making it a mecca for designers from all over the world. The colors and textures make it a visual playground. Here is a very good article on this unique neighborhood: http://sewstylish.blogspot.com/2007/02/fabric-shopping-in-paris.html