And please don't let them be F&B because I won't be able to talk DH or the decorator into them. 
I have to choose very quickly a neutral colour to go through all the main downstairs living spaces (might go a bit more interesting in the sitting room). At our last house we had Dulux Natural Hessian which seemed to pick up the colours of the room it was in, but I'm wondering if anyone has found one they completely love. I like grey tones, but it needs to feel warm without being yellow-y or peach-y. And DH has an antipathy to anything which might look in the slightest bit brown.