Great yarn on marriage preserved for all

The National Museum of Australia has accepted into its collection an unusual artefact of the same-sex marriage debate.

A bike covered in rainbow crochet has been featured at the National Museum of Australia. (AAP)

A bike covered in rainbow crochet left outside the Sydney home of the prime minister is taking pride of place in the National Museum of Australia.

In October last year, artist Eloise Murphy left the "Love Wheels" bike outside Malcolm and Lucy Turnbull's home in support of the 'yes' campaign for same-sex marriage.

Mr Turnbull posted a picture of the bike - which also has numerous photos of the Turnbulls glued on it - on his social media sites seeking the anonymous protester to come forward.

In one post, he suggested the bike could go to the National Museum or National Gallery to commemorate the parliament's passing of the same-sex marriage legislation.

Ms Murphy, an artist known as the "Treble Maker" who is known for her "yarn bombing" across Sydney, came forward in December to claim the bike as her work.

The Turnbulls and Ms Murphy came together on Thursday at the National Museum to witness the bike going on display.

"Eloise, thank you so much for this extraordinary work of love. It was created in love. It is about love. And I think for many of us, it will always be an enduring symbol of that extraordinary day when marriage equality was achieved," Mr Turnbull said.

The bike will be displayed for several days before featuring in a new exhibition in March.