Katherine Greer decided to make the colourful statement after learning about 34% of New Zealanders did not vote in the 2011 general election.
''I found that shocking. I wanted to do something to increase engagement in voting.''
She was afraid people, especially the young, had been turned off by the ''s... fight'' campaigning had turned into for this month's election.
As a fibre artist, she was aware of how yarn bombing had been effective overseas and thought doing something creative would be a good way of communicating the message to vote.
''Let's turn them on with something fun and friendly. Proportional representation means our votes matter. It's their opportunity to have a voice and they need to take it.''
The 47 bollard covers, made mainly from polar fleece, felt and wool by five women, had orange as their main colour as it was the colour used nationally to encourage voting.
The yellow-green colour was not meant to reflect her political views as a left-green voter, Ms Greer, who voted on her way home yesterday, said.
She was disappointed one of the covers was stolen, but they would make another one.
Watching people touch the bollards and children sitting on them was great, she said.
Ms Greer hoped it would lead people to vote or even look at one of the websites aimed at helping people see how their views matched with political parties' policies.
