BizzieLizzie

OBW uses one particular patterned fabric and the pieces are cut so that when they are joined they form the various patterns you see in the quilt.

http://www.quiltingboard.com/t-36316-1.htm

http://www.quiltingboard.com/t-35685-2.htm

http://www.quiltingboard.com/t-36954-1.htm

These are the tutorials that will explain better. Have a look it is quite interesting how one fabric can become a work of art!