This is a cute idea for a crocheted embellishment. Basically, you crochet a 6-sided granny square, then fold it to make it into a butterfly. To make the granny square, you'll need to know how to single crochet, chain stitch, double crochet, and reverse double crochet.
The only materials you'll need ...
Here's part II of a video series on how to crochet a granny square. In this installment, we're shown how to crochet the second round of the square.