[GothicBellydncr]

Well, this is the setting idea I have:

The year is 2663, and Earth is nothing more than a metal covered planet of a city, a metropolitan planet with artificial oxygen and massive space ports. Floating in vastness of space are colonies, each their own nation. Mars is dotted with dome like colonies, each run by their own government. It was in this year that it was decided they would try to organize the Earth, colonies, and Mars under one government rule, but this failed, and crime took over. Various crime syndicates rule the colonies and Mars, and Earth is nothing more than their play ground. Police have become useless, and the governments try to bring about a resolution. Chaos rules, and no place is safe in this time of anarchy. Bounty hunters and assassins are hired daily, and the police have been reduced to clearing bodies from the streets.

I don't have a concrete plot at the moment for the setting though.