I finally took some advice and sorted my wool into a proper palette and sorted my cottons at the same
time. At the ATW they use a lot of cotton and linen and I occasionally buy bags of left overs to use and to get an idea of what they do.
Here are some of the bobbins wound ready for use with a collection of cottons. There is my last ball of Marta's hand - dyed wool which I am using with the orange/red colours to replicate the ground. It gives a nice occasional fleck. I have also begun a colour strip which should, in theory, help minimize pulling out because the colours don't work.
You can see the effect of the hand dyed wool; I like it because it is subtle.