Themeda australis or triandra or any of the Themeda species have highly decorative seed heads and a soft weeping habit. 

They are wonderful for attracting small birds to your garden as they provide a fantastic source of seed and insects. They also provide nesting habitat for wrens like the Red-Backed Fairy Wren. Plant them on mass as they are found in the bush naturally, in our grasslands that are continually diminishing, or use them as a feature amongst ground covers or a contrast with other grass like plants with differing foliage.