I posted some "inspiration pictures" about using small backyard spaces here: https://www.helpfulgardener.com/forum/vi ... 22#p375722
Here's just one:
I think several of them would work well for you also, so do go look at all the rest.
Hasn't Australia had severe drought much of the 2000's? It looks like the area around the Gulf of Carpentaria has not been very drought struck, but the more south and west parts of Queensland have been. Even if you are getting a respite from the drought right now, we can assume there is more to come. Therefore, I think it is imperative that you think about water usage and plant drought tolerant things -- or take imafan's suggestion and don't plant.
Whether it is astroturf, decking, poured concrete patio (these days concrete can have stain incorporated and various kinds of stamping and can be really nice looking), pavers, flagstones, etc I think your corner could be very nice not planted, just with plants around the edges or lots of containers.
(Just as samples, all of these are concrete: