doesnt look too hard
when i had my dash apart to put my deck in i got lookin at doing the same thing....i think there were about 6 led's and a orange or red plastic sheet over them....my idea was going to change that plastic with a blue piece....i was going to use those colored sheets they put over the spot lights for concerts....you should be able to get the stuff from most music shops....this is all asuming that the led's are white of course...if you decide to try good luck...let us know how you make out...ill probably do it on a rainy day sometime
PEACE