The flag of Western Australia suffers from the same issues as all the other Australian state flags, literally, almost the exact same problems:
That swan is kind of neat though, so it will be retained, but the rest of the universal Aussi flag template is gone. The swan is a Black Swan, the state bird of Western Australia and a common symbol for them, showing up on their seal as well. If you've read my post on the flag of New South Wales, you'll understand my affinity for the Australian Aborigine flag, so my first idea to improve Western Australia's was a little lazy:
I think this one looks good, but if I rely too much on the pattern and color scheme, I'm not really fixing these flags, just shifting the theme of them. So with that in mind, here was my second attempt:
This one is a uses blue for the vast coastline of the state, yellow for the incredible mineral wealth, and retains the swan as a central figure, thus using common flag concepts with one that is unique to Western Australia. It is also a tad off center (top-to-bottom wise) so as to make it look like the swan is floating on the water. My only concern with this one was that the swan seemed a bit too small, so I made it larger, filling the space a bit more, but still maintaining a simple figure:
Voila, a new flag for Western Australia. Two down, four to go (five if I can think up a good one for the ACT).