I find this discussion iso illuminating - and I think you are all very right: just like shades of brown, blond, red are not the same, shades of grey are not the same either.
As a warm honey tone in my youth, I was shocked when my grey started coming in blue-silver. I love it; it was just not at all what I expected given my skin tone (as Barbara Diane says.) This has meant, though, that I can wear pastels for the first time in my life (that purple sari I posted in a past WIW; I had tried that on innumerable times and it had never looked right; and suddenly, with my cooing skin tone, it did.)
I think the smoky soft colours are working for me now because I am salt and pepper, but Joy, I think you are absolutely right - as our grey changes and our skin tones change, our colours change too. And I agree with you that those of us with greying hair can absolutely wear bold colours (as you carry them off smashingly!)
Ultimately, I found this article helpful as a starting point, but as Shevia pointed out, there is no one solution for grey hair and there really is a gap in the 'season' theory around grey hair. Personally, I am a mood dresser and so I can never subscribe to a set of colours; a few years ago I was all brights; now I am all pastels and neutrals; and I may be feeling the siren call of bordeaux, olive and cinnamon in my future. (And approprio - you have sent my mind spinning with the idea of bold prints with neutrals!) I just go where my mood takes me and find shades of the colours that work for my skin tone at that point.