If you want to use your colours in a race in Australia, they will need to be registered in each of the states you are going to use them.

To register, please contact the principal club or principal racing authority in your state. Their details are as follows:

Australian Capital Territory 
c/- Racing NSW 

New South Wales
Racing NSW
Phone: (+612) 9551 7500
Website 

Northern Territory
Thoroughbred Racing Northern Territory
Phone: (+618) 8944 7500
Website

Queensland
Queensland Racing
Phone: (+617) 3869 9777
Website 

South Australia
The Races SA
Phone: (+618) 8179 9800
Website

Tasmania
Racing Tasmania
Phone: (+613) 6336 2450
Website

Victoria
Racing Victoria
Phone: (+613) 92584258
Website

Western Australia
Racing and Wagering Western Australia
Phone: (+618) 9445 5333
Website