I was going to suggest lattices with vines, but see you’ve already mentioned that…but it would still look nice if you ask me! Maybe between the lattices you can attach potplants to the wall as well, at differing heights, i think that’s cute, and put some flowering plants in there to colour things up a bit. Flowers are always pretty, yes? OR! Attach iron arches to the wall, i’m sure you get ornamental stuff like that somewhere? And then inside the arch do that potplant thing i mentioned above. Yes, i think that would look pretty. Or get real arches with some depth in them and hang potted plants from the top of each one so that they hang in the middle of the arch. And then fix some metal artworks of some sort(maybe butterflies or sunflowers or sun designs or whatever!) against the wall to spice it up. What about painting it a medium shaed beige, or something? That should blend in with everything?