Forgot to add this:
Where I am, there are mostly old houses and apts. from the 1920's. Someone is always re-piping a house or apt. bldg. and they leave the old galvanized pipes in the alleys for the recyclers. Those old pipes are ideal for making arbors or trellises or arches. Pound them into the ground, insert rebar and bend it whichever way you like. Then, you can plant some small vine or clematis to cover the bare pipe.
People also toss out the tracks for vertical blinds. Those tracks have a very sturdy aluminum rod inside the track which is equally ideal for the same thing...and even easier to bend and shape. It also doesn't rust or get hot and won't burn the vine or rose, etc. and they virtually disappear in the sunlight.
