ONE way to improve the garden, particularly in bare spots, is to use groundcovers to change the aspect for a while or permanently. I have been using these flat stones for two decades.
I am not into gravel, popular concrete pavers, round, soft gray stones or white, a fad now. They never look attractive, except in rare instances when used as dry stream beds in proportion and correct context in the garden.
With very little effort these corners have been transformed and will enhance the spot as self sown plants start growing in the crevices.