Making shelves in the barn from old buckets is a useful idea. And things will not be thrown away, and shelves will be added, in the country they are never superfluous.
For a barn, garage or workshop, buckets with holes in the bottom and a little rusty are suitable. Anyway, things will have their place, as in the photo. Zinc buckets are advised to be used; plastic ones will not be so durable. On the other hand, you can put lighter things in there so that the shelves do not bend from their weight.
When planning to make shelves from buckets in residential premises, it will be necessary to carefully consider their appearance. It is possible to choose according to color and size, or to decorate somehow. But in the barn, such shelves are just that.