indicator bulbss can be blue when not lit but must flash amber, and headlights that are marked as road legal are allowed obviously, anything over 65w is illegal.
you can have blue sidelights aslong as they are not extremely blue, only tinted, you can get a whole range of interior lighting which is blue, i.e courtesy lights, in the boot etc. blue lights which light up your reg plate are questionable though.
philips do a road legal headlight and sidelight package for about 20-30 quid and if you have lexus lights you can buy silver coated indicator bulbs for about 3-5 quid.
hope that helped
