Think about the back of sit-com couches or the couch in your grandma's house. What is almost always folded neatly on the sofa back, or stacked in linen closets and hope chests? A granny square afghan.

One of the easiest crochet projects to master is the granny square. You'll have seen them all over homeware and interiors trends – often super-colourful, these squares are used to create beautiful ...