Flat panel display mounts configured to rotate about a vertical axis and at least substantially maintain rigidity about a horizontal axis comprise a mounting member configured to receive a flat panel display thereon, and an arm member attached to the mounting member. The arm member includes at least one hinge on at least one of a first and second coupling members. Methods of forming a flat panel display mount are disclosed. A modular sign including a housing, at least one sign panel, and a flat panel display mount is also disclosed.