Some of my NPCs don't get a description. It's not that they get less love from me, as I do love them very much. I portray them to the best of my ability, some of them are even really important- the main villain, the main ally. They just never really received a description, not from me and not from my players.
It is an experiment that I've conducted (ok, I conducted retroactively at first), and I really like its results. It is no secret that people care more for the things that they create, and I wanted to take that to the extreme.
You see, a great lesson that I've learned from horror GMing was that one should describe as less as s/he can the monster, so the players will feel the balks with the things that frighten them most. So I thought to myself- "why should I keep this trick only for the frightening stuff?"
My rational was quite simple- if each player will create for himself/herself the image of the NPC, each and every one of them will care for the NPC more. After all, it is (at least to a certain degree) their creation. And I must say that it worked.
So I still give all of my NPCs distinct voices, and I adopt certain postures for each NPC, and some of them I still describe. But some of them I just don't describe. Sometimes it is just because I forgot or because there was no real opportunity for it, but most times I do it with a purpose. I just really enjoy this bond.
Besides, it gives me more time for other things, like portraying them and stuff…
How about you? Have you once tried not to describe your NPCs? How did it go?