I have a set of blue ones installed. Not to steal this boards thunder but mustangforums.com has a link with install instructions.
How to- swap out your map lights (for LED's) *pics* - MustangForums.com
I didn't follow the instructions i just pulled the lens covers off (he is very much 100% correct in this post about where the long vs short tabs are located) but i had a ***** of a time pulling the light bulbs out. (ended up using needle nose pliers, didn't break a bulb but i advise against it. so follow the instructions assuming you can find that bloody clip)
They are very blue. In the back of my head i still think its bordering to much "ricer" but the ladies love it so i'll manage. And while they are blue and turn everything that shade they are very much brighter then factory ones. I recommend swapping to an LED regardless if its colored or not.