I first saw the work of Australian artist Fiona Hall at the NGV's Contemporary Commonwealth exhibition in 2006. Leaf Litter, from 2000 was exhibited alongside Tender, from 2003-05. Both pieces deal with the conflicted role that money plays in contemporary, multicultural society, and contrast the socialised concept of money, with natural, organic items - respectively leaves and bird nests.
Fiona Hall, Tender, 2003-2005
Fiona Hall, Leaf Litter, 2002
In an earlier series which I haven't seen in person, Paradisus Terestris, Hall creates intricate botanical sculptures out of sardine tins. The delicate, silvery sculptures speak of the vulnerability of plant species, and of the biodiversity present in Australia. Furthermore, the name of the series evokes themes of the garden of Eden, 'Paradise on Earth.' NB these ones are somewhat NSFW. Just a heads up.
Fiona Hall, Paradisus Terestris 1989-90