Several years ago there was a big display at the Sisters Outdoor Quilt Show of quilts made from wedding dresses. (The display was inside the clock shop, not outdoors.) They were beautiful. Many were crazy quilts, but not all. A couple of years later, a bunch of wedding dress quilts were for sale at one of the bigger quilt shows. I wouldn't know what to charge for that, but would have to factor in the added difficulty of working with non-cotton fabrics. Some of those fabrics show any pin holes, some are super slippery, some are stretchy and require interfacing - I don't think I would tackle it without more knowledge. There are places online that will do this professionally - see the link below. There are also some pictures online of really beautifully done wedding dress quilts. I think the nicer ones are beautifully quilted, letting the quilting provide much of the design.
http://www.thepatchworkbear.com/cust...ilts-c-47.html