There are many sources of free granny square patterns online, such as at AllFreeCrochet.com, which has many patterns for motifs both large and small. CrochetPatternCentral.com and About.com also offer a large range of free granny square patterns and tutorials.
Pinterest is another excellent source of links to free patterns highlighted by its users, most of which offer photos of the individual granny squares.
Granny squares are most often joined together to make afghan rugs and blankets. However, MollieMakes.com offers 16 different ideas for using crocheted granny squares to create items such as scarves, bunting, tote bags, pincushions and pillow covers. Other suggestions include jewelry, slippers and clothing.