I like the stock trough look in a garden. I guess because i was raised on a farm troughs look like they belong in a rural setting.
Here are two with spring tulips in them. After the tulips die back there are many other things that will come up including asters.
My horse troughs are oblong and not round. I like your round one.
I grow LA iris in wash tubs that have drainage holes six inches up the sides of the tubs. If i left water in a tub here i am afraid water moccasins would take up home there.