Picture frames have traditionally been made of wood, which is still the most common and most prestigious material, although other materials are also used, including aluminum, plastics or polystyrene, even sea shells. A picture frame may be of any colour or texture, but gilding is common, especially on older frames. Some picture frames have elaborate mouldings which may relate to the subject matter. Complicated older frames are often made of moulded and gilded plaster over a plain wood base.
L-style frames are a simple variety that are constructed with a single L-shaped border of wood, with the bottom part of the L, or rabbet, at the front of the frame to hold in the glass, object and backing, which are secured in from the back.