A while back I picked up a nice set of circulating commemoratives from Australia. The coins were chosen in a contest from student designs to represent each of the Australian states and territories. They were released in 2001 and 2002 as part of Australia's centennial celebrations.
I have tried to find out more about the designers and their thoughts on the designs. I haven't had much luck. But I did find this brief article on Lisa Brett who designed "Dancing Brolgas" for the Northern Territory.
http://www.ntnews.com.au/article/2008/02/09/3313_ntnews.html