I keep thinking that I am glad the grey trend is dying out but then I see something like this. If it is what you want then go for it but remember some of the other crazy trends that lasted a year or two. Then they are still on the boat 10 years later...........
I would go white with a little grey for accent as mentioned above.
My red, grey and white boat, for comparison. This is a 28' boat tip to toe so hull is about 26'. We originally had same scheme but with blue instead of red then wife made this call and we love it.
I think it shows that the full grey side really looks fine. Good luck with your cig. Do what you want, it's your boat.