The easiest way to change a bulb is to take the headlight completly out. They are held in place with a screw at the top and two clips on the bottom. I have had blue lights in my cars for last few years but to tell you the truth they aren't that great, look good but as soon as you get a bit of dirt on the lights you can't see a thing.
Looks good, I must agree coloured hoses do look much better, I have started colour coding my engine bay as well but it is far to dirty to take any pictures of it. Yours on the other hand is nice and clean.