This tutorial show you how to crochet a spiral granny square using four colours. To make this in two colours, just simply follow the same pattern but use two strands in one colour, and two strands in your other colour. The order you place them will create different effects!
You can use any yarn and hook size suitable for the yarn you are using that you like, but I chose to use DK / Light worsted weight yarn and a 3.5mm E/4 crochet hook.
Written pattern can be found here: http://happyberrycrochet.blogspot.co.uk/2015/10/how-to-crochet-spiral-granny-square.html .
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