Masking a tall ugly wall

Parents have just moved house & theres a large ugly wall at the back, the wall extends further to the left (not visible). Currently has a Virginia creeper climbing up the wall. Cant decide whether to try and train the V.creeper into the areas its not currently grown into ie the middle of the photo or whether to start again. Suggestions would be great for either something else that would climb without trellis (evergreen?). Slightly nervous about using Ivy as this can damage walls. Another option would be to put a deep flower bed using sleepers infront of the wall and planting tall thin trees, while they wont "cover" the wall they would provide prettier view. Any though appreciated as I'm not a huge gardener myself.
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First question, who owns the wall and have they given permission for plants to be grown on it?
It's often easier to create a screen or an alternative block of planting further into the garden - about a third of a way in from the back boundary is far enough. That way, the planting doesn't have to be so tall. Perspective
You can then have a simple gateway/entrance/arch to the section at the back, and it also means you can have an area for hiding all the working stuff that gardens need.
I live in west central Scotland - not where that photo is...
There's plenty to get on with at ground level and scope to do as @Fairygirl suggests and erect a pergola or trellis screen just this side of that bed at the end to disguise the wall when they're working or playing in the garden.
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
bird KK table or birdbath or sculpture etc, so that draws your attention when viewed from the house ... and then when you’re using the entertaining area you’ll have your back to the wall and looking back at the house.
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.