'Little Leprechaun' This doesn't link to a free pattern, but you could make this from any flap hat pattern. Alternate green and black for the hat, crochet the buckle separately and sew it in with matching yarn. Tie on yarn strings and braid them. You could even make the top part without flaps from a simple hat pattern.
Lightning McQueen hat Cars hat Crochet Baby Hat by stylishbabyhats