Hello all, here is my problem.

When I got my new bike, (new to me, it was used) my wife got my motobecane Vent Noir. Needles to say this bike is totally black and, although she doesn't complain, I know it's way to manly for her liking. Now, I want to change her cable housing to pink to give her bike a more feminine look. I've done a quick search and the kits I found are $30 and up and thats for either a set of shifters or breaks not both. So im looking at 60. That's kind of expensive to me. I used to ride bmx and know a place that I can get pink LINEAR cable for $10 for 50". My plan is to get that housing and get regular brake and shift cables (if needed, although I might as well since ill be in there already) that will run about $10 bucks.

Now I know that there are some parts on a road bikes cable system that aren't on a BMX bike. I forget the name but I know they are at the ends of the housing that goes into the STIs. Are they at the other ends of the housing? All that stuff I can figure out as I go. My main question is, would a LINEAR cable housing work or would it affect her braking and shifting performance? Is there something special in the $30 kits that justify their price? I estimate the total cost of doing all 4 cables my way to be around $30. Does that sound right or am I way off. Thanks for any advice and pleas feel free to tell me if I'd be risking my wives safety by going with the wrong idea. We ride in the mountains a lot so I need to make sure that the set up is safe and reliable.

Thanks
Joe.