Interior light color change

I would like to change all my interior lights to blue. How would I go about doing that?????

get blue bulbs?

Someone told me to get blue lights.Do they have them for all the interior lights? (ex. the little green light thats on the knob for the fog lights,the lights for the ac/heat, the lights for the temp.control are green also) I want all that has a green color light in the interior to be blue. If this is at all possable can someone help???????