throw things at the wall and see what sticks

ain't what it used to was

Is not what it used to be; (expressing nostalgia).

all things considered

Generally speaking; in terms of the big picture.

all things to all people

Someone or something that entirely satisfies the expectations of everyone, no matter how diverse and conflicting those expectations may be.

back to the wall

A very difficult situation with no beneficial options available for action.

balls to the wall

With maximum effort or commitment.

bang one's head against a brick wall

To waste effort on a futile project.

blue wall of silence

Strict secretiveness maintained by the members of a police force with respect to information which might be contrary to their interests, especially information concerning questionable police actions.

break the fourth wall

To apparently communicate with reality directly, such as when characters of literature comment on the existence of a reader.