This is a simply work-in-the-round hat pattern.
I used the Crochet Earflap Hat Gum Drops pattern (http://www.ravelry.com/patterns/library/crochet-earflap-h...) to crochet the edge, but you can work it in hdc or dc, as you prefer.

The final edge circumference is about 63 cm.

I used six different colours of the same yarn: N26 Blue Jeans (the main colour), N02 Ivory, N05 Bleu Layette, N25 aguamarina, N27 star light and N34 Bourgogne.
The hat required half skein of the main colour.