two words, angry mob

OMG eNGLISH Socker hooligans

silent hill nurses and other characters,
i was wanting to do the zombie group with my friends, it would make roaming the street rather interesting.

Pirates!

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You best start believing in ghost stories Miss Turner. You're in one. ~Barbossa

Cats - the musical

black scary Halloween cats

Crows

Singers from "We Are The World" video

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I don't mean to alarm you but your insides look very Halloweeny.

Scarecrows
Clowns

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When you're strange no-one remembers your name

Superheros and villains as mentioned earlier is a great group theme. My friends and I did that as our theme last year and it was very cool and resulted in a lot of very well thought out costumes because no one wanted to show up as one of six Spidermen, Batmen or Supermen. Another fun idea is video game characters. Literally thousands of potential character ideas there.

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Jack's Attic - Purveyors of antiquated, old world style, handmade, dark art jewelry.

How about SMURFS

One of my favorite mass costume ideas, especially during these political times, everyone dress as V from V for Vendetta. We tried to do it in my department at work bu only one other guy actually bucked up and did it. Still we looked good and freaked some people out. Nobody knew which of us was which.

Oh, and if you haven't seen the movie, watch it. So you know why it's okay for 20 people to be wearing the same costume.

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A Huge dose of reality in one bitter little pill.

My friends and I were thinking about going as the cast from Back to the Future. This would leave room for plenty of costumes since you could create costumes from teh 50s/60s, the old west, the 80's, and the future even if some people played the same character