Learn how to crochet this Swirling Rainbow Blanket by watching this step-by-step video tutorial. This is a free crochet pattern. The finished blanket is a pentagon shape, meaning it has 5 corners. The sides are trimmed with a heart edging. This blanket is very versatile and can be used for many purposes; like a stroller blanket, lap blanket, dog blanket, summer blanket or even a floor rug.