Okay, so here are my ideas, they're pretty rough, so don't be too harsh.
A desert waste land influenced by the poverty and depression current across many of the middle eastern regions today. I want the cultures, religions and lifestyles to have a major influence on this game concept, things like their gigantic divide in the lower and upper class societies and the struggles between the two.
An industrial world covered in things like train tracks, plants, buildings, factories, similiar to star wars except featured more towards our current period. I want this world to be in a state of conflict between its natural environment, which will be swamping and strangling the planet in retaliation to mankinds industrial expansion.