Picture frames are generally square or rectangular, though circular and oval frames are not uncommon. Frames in more unusual shapes[6] (often appropriately coloured) are usually frames intended for photographs, such as heart-shaped frames to go around wedding pictures and the like, and there have been shaped shadowboxes made, though these have generally been used to roughly follow the outlines of sports jerseys and other memorabilia rather than pictures. There are also picture frames designed to go around corners. A popular design is the scoop, an indent in the frame adding depth.[7]
Source: http://en.wikipedia.org
Reference:
1,"Weird Bird in Love >> Blog Archive >> Upcycling Picture Frames". Retrieved 2010-06-27.
2, Daniel C. Boyer's acrylic on canvas The Prime Ministers of the Acerbic at the Samurais´ Picnic is wood-framed and decorated in pencil and "Dad Bay, or, The George
Strait" has a frame similarly decorated with coloured pencil.
3 "Patent application for trimmer to remove excess backing paper". Retrieved 2009-12-07.
4 "Black Tyvek sold as backing paper". Retrieved 2009-12-07.
5 "Daniel Smith: Lineco Frame Backing Paper". Retrieved 2010-06-15.
6 "Soccer Ball (Football) Shaped Frame for sale on Amazon.com". Retrieved 2010-06-25.
7 "Weird cool images". Retrieved 2010-06-27.
8 Mummy Portrait found within a wooden frame, Egyptology Online
9 Picture Framing Magazine, "A Survey of Frame History, part 1" by Diane Day, August 1998, p.82
10 Picture Framing Magazine, "A Survey of Frame History, part 1" by Diane Day, August 1998, p.82, 84
11 Picture Framing Magazine "Frames of Reference" by Tracy Gill, May 2000, p.85
12 Francis I of France Francis I]
13 Louis VIII style
14 "Picture Frame" (SHTML). Crafty Ideas. KinderArt. Retrieved 2009-03-21.
15 "Block Mounting". Retrieved November 30, 2011.