Free pattern for a crocheted baby blanket. You may make this pattern any length or width you wish, simply by adding rows and strips. For an adult size, 17 strips and 100 rows becomes a very nice afghan.
Ravelry: Granny patchwork I think this is the most beautiful granny square project I have ever seen! - Love the idea, link describes a different type of blanket, should be able to piece this pattern together from the images.