there's a pretty simple solution to this that I'm surprised you havn't thought about.....
All the hoses under the bonnet, within the engine bay, order them in blue, then it'll look nice when you pop the bonnet.
The lower hoses that come off the core, order them in black, then it'll remain stealthy.
there's a point on each side there the hoses leave the engine bay and disappear, only reappearing again on either side of the core. Nobody is going to care that they're black externally and blue under the bonnet, and you get the best of both worlds
