Tutorial: Lexus Lights
Quite hard this one, and can only be done on SOME cars! Thanks to Max Hogblom for giving me the idea.
       
 Lexus Lights
 
Difficulty - ***
The lights on this car can be made into lexus style lights.  
FIRST, Lasso (L) around the outside of the light.  

Hold Alt as well as using the lasso tool, and begin deselecting the areas you want to be coloured.  

Go to

Image>Adjust>Colour Balance / Channel Mixer Box

and select monochromatic.. This takes away the colour!

 

And that's it.. Lexus style lights!