Posted: 16/04/2017 at 07:34
Blimey - I won't repeat what I said when I saw that!
I'm with Pansyface on this. A pot of masonry paint isn't that expensive. I would say a creamy colour too as it works with everything and will be cheerier on a dull day. I used one for the rendered part of my new extension last summer. It's just B&Q's own brand and it's done the job. The colour of butter.
You can then paint your containers a contrasting or toning colour - whatever takes your fancy.
The garden centres and DIY stores will still have things like sweet peas which you could plant to give you a bit of summer colour. You'd need to attach a few wires or trellis for them, but if you don't want to do that, some 6 foot canes in the boxes will suffice. I wouldn't go for honeysuckle in your boxes as they would probably struggle a bit. Clemtais will be fine, but again, you'll need some support for those on the wall, or a decent sturdy structure in the containers.
If you're handy with a few power tools, you could attach some wall baskets to grow stuff in too. That will break the area up. I'm doing something similar with the above mentioned wall as there's quite an expanse below my windows. I have three wall baskets which will have dark nasturtiums in them, to work with the hot colours in the bed below. Eventually there will be clematis as well. There's still plenty of time to do something similar with plants that prefer a bit more shade. Even lettuce will be happy in those if you fancy it