Legal colors in Xenon etc

Anyone have any legal info about colored xenon lights for the different lights of the car? I have the superwhite ones for my fog and headlights and heard that blue can be a touchy legal subject. I want to do the corner and side markers and was planning on doing everything in them at some point if I could. Along the same lines was wondering if you replace the amber lights with the clear ones, do you have to use amber bulbs for the blinkers and such.