The "My Hung" wholesalers in parramatta/cabramatta should have a wide range of colours. If you're looking for a variety of weaves/textures in addition to colours, Tessuti is your new best friend (Chatswood and in the city... in the Glasshouse thingo?). They'll be a bit pricey but you'll get a lovely range there, with a lot of 'specialty' silk fabrics not avaliable at big chain stores like Lincraft or Spotlight.