Supplies:
Embroidery floss
Size 6 crochet hook

From website:

My schedule has been too hectic to finish any real projects lately, so I’ve been getting my crochet fix by whipping up these tiny little butterflies in every color. The trick? Use embroidery floss. It comes in every shade imaginable, it’s the perfect thickness for little accessories, and it’s cheap. They’re perfect for cards, scrapbook pages, hair clips, they’d even be cute on the front of a baby onesie or beanie.