Crochet Zig Zag Blanket

I have finally started my Crochet Zig Zag blanket. I bought three balls of colour from the Yarn Barn to start with to see how it would look. The length of the blanket is 1 1/2 metres x how ever many balls of wool I end up using. 3 balls makes about 10cm.

What do you think of the colours? My sofa is grey, so I am hoping that purple will go nicely with it. And the zig zag pattern is a bit more refined than the crochet granny squares.