Asalamu Alaikum
Hmm I see.
Well, it is nice to attach ourselves with colour of the dome which sits on top of our beloved prophets mosque, but to think that this is our favourite colour with the idea of this being the prophets favourite colour is pretty weak, right?
The colour white is the best in my opinion. It symbols more than one thing. Not just peace, cleanliness, and sanity. I like white. I believe our prophet also liked white and not green?