New South Wales
These flags for New South Wales contrast the current ensign's royal blue against a lighter sky blue (the ). All but the first proposal feature a stylised , the state flower (specifically the depiction in the current government logo).
Queensland's symbol is a crown on a , which I placed on a field of the state colour of maroon. #2 and #3 reference the nickname "Sunshine State" (which the state shares with Florida and formerly South Dakota in the US) by golden rays.
SA's state colours are red, gold and blue. #1 is a bicolour charged with the state badge (which features the ), bearing a similarity to the ; #3 instead uses a diagonal triband. #2 is based on SA's floral emblem, , which has a black center and two red petals.
Nineteenth-place entry in /r/vexillology's celebratory 100th contest, in which designers revisited the subjects of the previous 99. I had had the idea of the stylised map/animal head since November 2014, but failed to make a good flag with it until (fittingly, given the theme of revisiting things) reusing the symbol for a new design for this contest.
Like other Australian state flags, the current flag of Tasmania is a British Blue Ensign. This redesign uses the state colours of bottle green, maroon and yellow; the waves are based on the state coat of arms. The arrowhead symbol stylises the shape of the main island as well as vaguely resembling a silhouette of the head of the state animal, the .
Based on the current flag's Southern Cross and St. Edward's Crown and the state colours of blue and white; #1 and #3 also incorporate the downward-pointing triangle used in the state's branding, presumably symbolising the initial "V".
Basically a banner of state badge and added the waves.in the state colours, I took the black swan from the