Okay, this is going to strike some people as weird, even disrespectful.
It isn't disrespectful, but I admit it may be weird.
What if Ferguson protesters leverage imagery from Hunger Games: Mockingjay?
A lot of people have no substantial direct experience of systemic injustice, and no experience standing up to it. But they (we, frankly) go to the movies.
Mockingjay is a movie about people standing up, united, often at great personal risk, against an established and organized system of oppression. People don't watch that movie and cheer for President Snow and the authorities in their struggle against the dangerous radicals. They (again, we) cheer for the ordinary people pushing back against police/military/"peacekeeper" violence.
Now imagine people seeing unarmed, civilian protesters facing riot-squad armored copsoldiers, and the civilians are singing that touching, haunting (ripoff of black culture) song, "Hanging Tree". You know, from that movie?
It's like a real life scene from Mockingjay, and our side are the good guys. The imagery is all the same, it's just put in a different context.
Yes, this would give free promotion to a movie that, however good, doesn't need it and hasn't earned it. But it'd make a pretty cool propo.