Abstract: A plurality of mounting frames are provided and have front and rear faces. Each of the frames is defined by at least three elongated interconnected peripheral sides and at least one side of each frame includes a recess formed therein opening outwardly of the rear face of the frame. A connecting member is provided and includes a panel-like body member having front and rear faces. The body member includes at least two spaced projections projecting outwardly from the front face thereof and the frames are disposed in side by side substantially coplanar relation with the sides thereof provided with recesses disposed in juxtaposition. The body member is positioned with its front face closely opposing the rear faces of the frames and with the projections removably frictionally telescoped into adjacent recesses of the frames and the connecting member thereby retaining the frames against separation. The frames may be of the same or different shape and may be of different sizes.