I'm making a turn based strategy game. I have the core mechanic but I have more than one idea for a theme & a title (surprisingly the mechanic fits almost equally to all of them).
This topic is purely about how *you* personally feel about these theme, which one makes you want to play it. That's the most important criteria.
1) Industrial Revolution - you run a small island country in a Victorian era and try to convert agrial society into an industrial one, there is no war/combat.
Topic: http://www.gamedev.net/topic/650519-industrial-revolution-strategy-post-mortem-and-ideas/
2) Steampunk Industrial Revolution - like above but less historical and more fictional. With zeppelins, weird steam machinery, mad scientists.
3) Dictator - you are a dictator of a small island. Less focus on industry and more on internal struggle with rebels, coups, etc (there is combat).
Topic: http://www.gamedev.net/topic/650697-dictator-rebels-uprising-coups/