Deidra McMenamin is calling for people to lay down their arms - using art.
She's been sharing her peace message around the world, from her native Northern Ireland all the way to Wanganui, by putting casts on people, which they decorate.
Deidra has put casts on the arms of more than 1500 people, but she is not an orthopaedist - rather an art therapist. Yesterday, the girls at the YWCA holiday programme were having their arms plastered to remove and decorate once dry.
Rylee-Joan Wroe, 10, decorated her peace symbol cast with stripes and sequins while others added flowers to their designs.
"I ask them to visualise the sort of world future they want to see and base their decorations on those thoughts," said Deidra.
Spreading the peace message around the world since 1995 with her project Lay Down Your Arms, Deidra has caught the attention of John Lennon's widow Yoko Ono. "She sent me an email saying that John would be proud of what we are doing."
Deidra says her workshops are good therapy for people at the frontline of conflicts such as police and military personnel.
"They do it for their country and their family because they want to keep them safe but nobody talks about the long-term effects or how they can recover from what they have experienced.
"Post-traumatic stress disorders can be so long lasting and people have hurt hearts."