This is an awesome idea. Not something everyone needs to worry about in terms of height, but you can apply the same basic principle to the side of your house or even your garage. What this is reminds me of is a trellis, but with silver galvanized buckets comprising multi colored summer flowers that just make a plain boring building come alive with color.
There is a metal frame, but this wouldn’t be required if you were to try it on a smaller scale, but a simple wooden version, or even wire mesh could induce the same effect.
If flowers were not your taste, you could get extra benefit by growing a selection of herbs on the outside of your kitchen wall.
Image Source: tumblr.com