Re: Klingons in STID--why do they look like [SPOILERS]?
I also liked the use of piercings/jewelry. I can imagine that those would be used to signify rank or enemy kills.
I don't think they'd do that. Klingons have never worn rank insignia of any kind, since they can be trusted to be exactly the rank they say they are - it would be grossly dishonorable to lie about your rank or how many enemies you killed.
A Klingon might wear things like this as pure decoration, but not to signify anything specific. Their word is good enough.
It is by caffeine alone I set my mind in motion. It is by the beans of Java that thoughts acquire speed, the hands acquire shakes, the shakes become a warning. It is by caffeine alone I set my mind in motion.