I had the same question?? I was on the NSW RTA site tonight..
Here is a link to the price list http://www1.myplates.com.au/products_pricing.html
I was trying to find pics of graphite blue MKV so I could find examples of what others have done but no luck...
I currently have white plates with black writing, which I dont mind but considering black plates with white or silver, not sure how it will look.
Go thru member rides there are a few silver ones that might give you an idea..