These are the best signs from Australia's pro

The Babadook, Marge Simpson, and Daleks campaigned for marriage equality on Sunday. Sorta.

Thousands marched in Sydney and Brisbane on Sunday, to show their support for same-sex marriage in Australia, ahead of a national postal vote on the matter.

With an estimated 30,000 in attendance in Sydney, rally organisers have said the Sept. 10 event now sits as the largest LGBTI demonstration in Australian history, a declaration reported by ABC.

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The rallies came after Australia's High Court handed down a decision Thursday to allow the federal government to lawfully use $122 million to implement a postal plebiscite on the matter of same-sex marriage. The non-binding, no-compulsory survey will ask the question: “Should the law be changed to allow same-sex couples to marry?” 

SEE ALSO:High Court's same-sex marriage survey result sent Twitter into a frenzy

Australians will receive their postal survey after Sept. 12 and will have until Nov. 7 to mail it back to the Australian Bureau of Statistics. Then, the survey results will be announced on Nov. 15, after which the issue will be voted upon in federal parliament.

Ahead of the impending postal distribution, rallies were organised in Sydney and Brisbane to campaign for a 'Yes' vote.

As always, creative flair was out in spades on rallying placards. Here are our favourites from the Sydney and Brisbane rallies:

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