Abstract: A mounting system (1) for artwork is disclosed, comprising a blank (3) of planar material, comprising a rectangular main section (7) for carrying artwork, which has first and second integral tabs (9) extending from respective opposite sides of the main section and which are foldable into a three dimensional box-like shape behind the main section to provide first and second perimeter members. The system also comprises third and fourth integral foldable tabs (11) extending from the remaining sides of the main section and which project outwards by a lesser extent than the first and second tabs. The system also comprises a plurality of separate extender tabs (5) for attachment to the third and fourth foldable tabs to permit said tabs to be folded in a likewise manner to form third and fourth perimeter members behind the main section.