Well, I remember when out on a ride an old riding buddy's Blue hosing just ripped/snapped apart, for no real reason, I think he turned the handle bars. Admittedly it may be because of wear and tear (but he put about as much stress on the cabling as I [or probably anyone] would, and he didn't stack very often) but I think I'd still rather stick with black.
Still though, blue hosing to match the bike? I mean, come on, it's hosing for Christ sakes (Y)