Did you know that the Australian authorities created a flag with the national colours?? With green and gold? And precisely blue equally. No? Well, this flag was created in 1970, for changing the Blue Ensign on the dependency of Papua New Guinea. This was one year before the independence from Australia. As this territory, former German colony from 1884 to 1918 as 'German New Guinea': 'Deutsch Neu-Guinea'. Then this was a League Of Nations Mandate given to Australia, until 1971 (in fact a kind of protectorate). This flag is a tricolor flag with vertical bands, in the following order: blue, yellow, green. On the blue part, in the center, there is the Southern Cross made of five-point stars and on the green part, a white silhouette of lyrebird. This is clearly the national colours of Australia given to PNG!! So we can say that the Commonwealth has created without knowing it , a version of the national flag of Australia!
Source: Wikipedia, http://en.wikipedia.org/wiki/Flag_of_Papua_New_Guinea That can be this way for Australia.