Someday, when those Lotto numbers finally hit, we'll do more than buy a throw pillow or just ogle the shimmering fabrics in this NorthPark shop. Maybe by then we'll have developed enough good taste to do justice to Silk Trading Co.'s vast collection of materials--they offer a selection of 2,400, from embroidered silks to cotton and linen, as well as paint and other goodies to fix up your mansion. More than simply a drapery store, they also do custom bedding and furniture; you pick the cloth, they cut and stitch it or use it to upholster couches and chairs sold at the shop. (Prices vary depending on the fabric. The cost of one style couch, for example, can range between $1,600 and $5,000.) Just the thing to dress up the trailer when that lottery ship comes sailing in, which we don't doubt will be any day now.