An obvious place to start is with climbing plants. Providing you use the right support, you could grow climbing plants up any wall surface and in any outdoor space.
There’s not much to say about paint because we all know what it is. You can get paint for all wall surfaces, giving you great flexibility over designs.
An inexpensive and quick solution for covering walls. You buy it in rolls and then just fix it in place. It’s the same for bamboo fencing, which you can buy or make yourself.
You can decorate shelving to hide an ugly wall or set up a cabinet to use as an outdoor bar. Whatever you choose, make sure it’s not pricey furniture because it could get ruined outdoors.
Are one of the most effective. Aside from painting, they probably provide some of the best wall coverage with minimal effort.