I've noticed a few of the pro teams are matching the front of their frame/fork colour with bar tape e.g. Bianchi celeste, Merida orange. They both look pretty good, especially the Merida. Matching the Ridley logo might give a similar effect, although I noted that you don't like red bar tape. How about matching the lighter grey highlight on your headtube? I think that would look pretty slick actually, flowing from the headtube into your drops. You could even go for a bi-colour fade grey-black.