All up now I've made 30 circles!
We worked out that there are approximately 504 colour combinations available to me with the 9 colours I'm using! So that means that I should be able to finish the blanket without repeating a colour combination! I'm still undecided about what colour to use as the "hex" part and for joining them all together.
As luck would have it, I am currently knitting something in dark navy, so I took this photo of a circle with each colour on the edge placed on my knitting to get an idea of what it might look like.
I do like the way it looks. Any opinions welcomed :)
I do also love the fuschia and the purple, but if I use one of those then all the circles that finish with those colours will maybe be a little lost. I'm not sure. For the moment though I'm going to just continue making circles until I have used up all my yarn. I'll made a decision on the final colour then. That should give me plenty of time to think about it!