All look like Acacia melanoxylon? Blackwood or similar

Hello,
I agree with greyim, they do look like black wood wattles, not a fav of mine personally, they could also be an acacia commonly known as golden wattle, which are found around the victorian goldfields region and dont seem to grow very large, but then again your plants dont look quite as "sticky/straggly" in their habit, their are so many Acacia sp, that unless you know exactly where the plant originated from you could be guessing for quite a while. They can make lovely shrubs, but remember they dont live a long time and often they will sucker everywhere you dont want them, not to mention they strike very easily from seed. I hope they bring you lots of joy and attract plently of native birds, enjoy them while you can.