Here are my themes;

• Running out of resources
• Every turn has a twist
• Looking in or out?

I like the last one because(bit of an antidote here) I recently was brushing my teeth and was looking at myself as you do in the mirror, and in my head I said to myself - "Am I looking in...Or...Am I looking out?". Thought it would be a really good theme that would spark some interesting ideas.