Another Australian flag proposal. Maybe it will inspire someone. It is based mainly on the flag od ACT/Northern Territory (design). Blue tone came from official flag of Australia, kangaroo comes from RAAF roundel.
Partially based on:

Flag of the Northern Territory.svg
Flag of the Australian Capital Territory.svg
Ensign of the Royal Australian Air Force.svg (RAAF roundel)
left panel idea/design: Robert Ingpen
kangaroo: Royal Australian Air Force
elements combined by Arvedui