Not all pictures are rectangular. Some pictures are perfectly square, and square can be really fun to decorate with.
However, it is hard to find square frames to fit square pictures. Many customers end up custom framing there square pictures, which is a great option, but not everyone has the time to custom frame.
For quick fixes Bev's carries square frame sizes along with their rectangular. The sizes we carry are 5 x 5, 6 x 6, 8 x 8, 10 x 10, and 12 x 12.