Eh, I think it looks cool if it's not overdone. I think the pictograms for the selector switch look cool colored in. That's about it, though.
I did it on one.White/red for the selector and OD for the rest. Did not want it to stand out too bad. My Fals came from the factory with some of them filled in. Just a personal thing but I have been doing it on some guns for over 20 years.