I use incandescent blues in the whirlpool (as opposed to LEDs or whites with blue rubber caps). Also, I use a blue flasher cap for the whirlpool flasher (I may have put a blue LED flasher in there too, I can't remember.)
I also use blue LEDs for the river letter and river class inserts. Looks better in my opinion.
I keep the mountain flashers red because blue there doesn't look right to me.
My GI is all incandescent at the moment but I do use blue incandescent bulbs in the rear of the game only. The soft "aqua" blue color seems to match better to my eyes. This also darkens the area around bigfoot a tad so when my spotlight mod comes on its more noticable. I may switch over to LEDs and use a GI OCD board. I won't switch to LEDs in the GI for this game without the GI OCD board because it sacrifices the dimming (and WH2O uses lots of it).
You can see pics of my game at the bottom of page 2 of this thread if intersted. I've made some changes since taking those pics but the blue incandescents are in there.