While I didnt do granny squares in the past, I have taken the plunge and heres the general design.
Now, its not exactly going to win me craft person of the year awards, but, its going to be a mid to dark blue for the spiral and white and actually I think its going to turn out OK. I’ve possibly allowed in the pattern for it to be bigger than I need, so, what I will do is work out in rounds until its about right. Im not sewing them together yet, why? Well if I do more blue squares than I need it could look odd. Which if this makes any sense as you go round the square from the previous round is invaded by the diagonals of the next round.
Initially I had done the 5 in the middle but then noticed I didnt have any more blue of the same colour – so have restarted. Sigh.