Ornamental pears, bamboo, magnolia even add a decorative screen for a feature, architectural plants, trailing plants like dichondra‘silver falls’ trailing rosemary that will spill over the edge to soften the look will look beautiful.

Thanks for including orientation. Climate is useful to know too.

Dichondra 'Silver Falls' and prostrate rosemary are good suggestions. One that I thought of is convolvulus. I've had more luck with it in shadier situations but I've seen it in full sun. Maybe it's to do with the soil, my shady garden has improved soil and my sunny one does not?

It's a nice looking wall so I guess you'd want something wispy to enhance it rather than something dense to disguise it?

Bamboo would look good, but make sure it's the clumping type not the running type, and put a root barrier down anyway.

There are various thin versions of plants available nowadays, for example Callistemon 'Slim' and Adenanthos 'Silver Streak'.

Another idea is to espalier something along the fence, for example star jasmine, unless you don't like the fragrance, some people love it ansd some people hate it. Of course something like that, more formal and structured, would require more maintenance.

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