I could be interested in the hoses, if I start having problems with the originals, and like everone else, it's going to be a matter of cost, as to which hoses to go for.
As for colour, anything but black. I could be wrong, but I feel It would make it easier to follow/track the hoses, in amunst all the other engine "bits and bobs," (techical term

) and it would also look pretty.

Also if just doing one pipe at a time, if available as separates, It would make it easier to see which hose/s you've already changed, and which hose/s you need too. Especiallly usefull if you have a memory like mine.
Thats enough of a random ramble for now!
All the best in your venture, flippa.