The single largest section in a single coloured thread is the lower central area, in green. This has taken a while to do, but here it is!
First a bit of it, showing the transition in the design from the blue to the green thread:
And the rest:
All of the green and some of the blue:
Despite all the work that's gone into all that, it's actually just the background! Next, I'm going to start on the major parts of the overall design.