A modular display system includes a plurality of frames, each frame comprising a sidewall connected to a sidewall of another one of the frames by a frame connector. A panel is removably attached to a front face of at least one of the plurality of frames by a panel connector. A border element is attached to the sidewall of one of the plurality of frames by a border connector. The system is secured to a mounting surface via a cleat removably mounted to a sidewall of one of the plurality of frames. Each of the frames includes a plurality of connector receiving sections arranged about a perimeter thereof. The connector receiving sections define a commonly sized recess formed through the sidewall of the frame in a width direction thereof and are configured to accept each of the frame connector, the border connector and the cleat therein.