I'd be happy with bg blue.
I posted this company on the site afew months ago but couldn't be bothered to actually ring them up so good on you for doing that. The thing is, I wanted the colour due to twill sheets looking awful laid on a customers carpet when they're basically old or dirty. I wanted a colour to hide the sludge stains! For me, grey would be defeating the object really. Im after a darker colour so id settle for black but blue would be my choice.