Or RAL 7015, Slate grey. I think this shipping container illustrates how well that would go with yellow decals:
And I would like the distinction of owning one of the first bikes designed after a shipping container. I think both of these colours are pretty nice, and maybe a little lighter than the matt black/carbon colour which is becoming a bit ubiquitous.
reminds me of Tommmmmmm's Graham Weigh paint job inspiration