Vigils have been held in Sydney, Brisbane and Melbourne for condemned Bali Nine drug smugglers Andrew Chan and Myuran Sukumaran.
Candles were lit and paintings of the men were carried by about 50 supporters outside the Indonesian consulate in Sydney on Tuesday evening, while others gathered on Sydney Harbour.
About 10,000 flowers were used to spell out "Keep Hope Alive" on a hill overlooking the harbour, at an event organised by Amnesty International.
Lauded Australian artist Ben Quilty organised candlelit vigils in Brisbane, hoping to sway Indonesian President Joko Widodo's favour.
Quilty, a long-time supporter of Sukumaran and Chan, has called for the men to be pardoned.
"With his passing my world will take a dark plunge backwards," he said of Sukumaran.
In Melbourne a vigil was being held outside the Indonesian Consulate General in the CBD.
Many in Sydney said they came to show opposition to the death penalty and to add their voices to the plea for the men to be allowed to live.
"I'll be destroyed as a person if this goes ahead," Sukumaran's friend Kavita Krishnan told AAP.
"I had my moment of despair yesterday, but we've still got time, there's 32 hours."
The vigils were organised after the Bali Nine ringleaders received warning they may face the firing squad as early as Tuesday.
Linda Lindquist drove from Shellharbour, south of Wollongong, to the Sydney consulate hoping to make a difference in what could be the men's final hours.
"These two individuals have shown to have reformed and justice is about giving people a chance rather than just killing them," she said.
Quilty rose to prominence in the Australian contemporary art scene for works which often focused on the destructive character of masculine youth.
He acknowledges that "Myu made terrible mistakes".
"So did I, but Myu, his family and his friends will pay a dreadful price for his youthful self-indulgence," the artist said.
Foreign Minister Julie Bishop said she was "very disappointed" Indonesia ignored government requests to delay execution notices until after Anzac Day.