If I wanted blue lighting on interior ... what do I need?
 

Dome light - bulb only?
Ambient light LED - can be changed???
Footwell lights - what size/type bulbs?

Or should I not bother?

how did you get your engine cover blue?? just regular spray paint, or did you buy it

2 steps - high temp spray paint, blue, then clear engine paint as a clear coat after.
 

with lots of sanding, etc, in between.

Cheaper - blue sunglasses

hrm, red = best for night vision, blue = bad
 

my eyes freak out when i drive in my buddy's passat. but that's just me.

Buy a civic

I don't want them DURING driving but as ambient lighting while the doors are open, for example ...

if you want to do interior lighting... neon does work well... (more)
 

I have 4 12" tubes in my footwells... red of course to match the interior. I put a custom switch kit in, so its all via remote. you could hook them up to whatever kind of switch you want, they dont use too much power. to get the rest of the interior blue, you could flush mount some neons or LED's in the headliner ( take apart one of those neon style tubes with LEDs in it, and hide it up above the headliner) there are plenty of ways... mine doesnt look rice, I get compliments on it... but its very subtle...
since I have black interior, its not as bright. I did blue in a light gray jeep interior.. very bright!

I'm also available for bachelorette parties and weddings...