Using a flat picture frame as a base,cut two strips of standard lath 3 inches longer than the frame's height;then cut two that are equal to the frame's width from one side corner to the other.
Attach all four pieces to frame with wood glue or hot glue, keeping the pieces flush against one another.
Cut two more strips of lath 3 inches wide than the width of the frame,and glue in place horizontally over the first layer. For diagonal corners, cut four strips to 5 1/2 inches each, and attach at 45 degree angles at each corner. Paint if desired, or leave natural, and attach cup hooks to hang.