Each to their own, but I personally feel the YB looks too modern in most OSF's which are pre-80's/90's while the YB always feels post-80's/90's (yes, I know the dates overlap..)
A friend has an NA YB cam-cover he's done entirely in crinkle-black, which I think really suits the car - a Mk2 RS2000. Feels more 'of the time', like the BDA cam-cover.
I personally hate stuff like Union Jacks, St Georges' or Scotish cross's airbrushed onto cam covers - all very american hot-rod or Euro-scene. Just keep it nice and simple: black or silver if it's pressed steel, or otherwise a nice crinkle-black.