My brother was boiling mad. (This implies he was too angry.)
The assignment was a breeze. (This implies that the assignment was not difficult.)
It is going to be clear skies from now on. (This implies that clear skies are not a threat and life is going to be without hardships)
The skies of his future began to darken. (Darkness is a threat; therefore, this implies that the coming times are going to be hard for him.)
Her voice is music to his ears. (This implies that her voice makes him feel happy)