Hmmmm.....What to do?

Yesterday we had our first session in an instructional series on by Ian Holmes on how to build a micro layout from start to finish. The session was held at the Princeton Depot. Ian talked about his past modeling and what has inspired him to keep modeling small layouts. He also instructed us on areas to find inspiration and of the possibilities of micros. It was very interesting and highly motivating. However I was left with one major problem. What is my layout going to be about? I found some great mining ideas in books. The DM&IR has allot of great spots to model. I am also vary fond of logging operations. I really enjoy all the hand made equipment and how the logging roads did what ever they had to do to get the job done. There are tons of other options that would be allot of fun but I am sure that it will be one of these two subjects. What ever i decide to model, it has to fit some criteria. The layout has to be under 4 sf., easily portable, light weight, it has to have action to the scene, HO scale, I would like it to be in a fall setting, I want it to run hands off, light track work, steam era (shay or small rod loco). I will put some thought into this and see what comes out of it.