After looking broadly at a number of topics under each of the themes; particularly at tiered government and consumerism..
I'm now hooked on something completely different!
India, China and "The West" -- three global giants competing for power.
[ECONOMY] themed -- as India and China are fast becoming two of the most important players in the world's economy; some sort of exploration into what future effects or importance this will bear could be really interesting and really visual. The whole area is just so topical at the moment (India VS Australia in the cricket -- all the politics and dramas that went on; China with the Olympics and America's fluctuating economic status), if I did something that tied everything together and made a statement it could be very effective.
I need to get a specific "propaganda" direction/issue in this area, but VISUALLY I can already see this working really well. There's so many issues (and existing images) to explore; consumer-idealism from "The West" culture, changes in Asian culture/art/attitudes, shifting political power -- just to name a few. It could almost end up being a combination themed topic as "The State" and "Citizenship" might also come into the issue, with cultural/global identity (and cultural pollution?) and political head-butting also weighing in on the rising-Asian-economy situation.