All That Glimmers Couture shoe designers always say that silver shoes, or gold, are the best buy when you want just one peerless pair. But if you pick up some this season, you don't have to pay a couturier's ransom. For the holidays and beyond, precious-metal-color pumps, flats and sandals seem to be available all over town. And they give a glimmer to everything from faded jeans to formals. Some cost the fashion-budget equivalent of a dime a dozen, some cost a mint. The silver-and-gold flats with flirty bows shown here are $60, at Ylang Ylang in Beverly Center and the Rodeo Collection.