That combination of the SAME STYLE DESIGN with those rolling hills above the text is gonna be problematic, I would think
Look into SignBlazer Elements, which has a few rustic sign borders included in the Library (Draw menu --- SignElements -- Panels)
There are three different types with wood branches as borders, and two with scenes that say "Outback" (one a windmill and another with hopping kangaroos) -- Jerry Bonham, the creator of SignBlazer, was Australian, so that's why these are in there !!!
You would be able to use these, without copyright issues.