When code creates things that are beautiful and that I didn't fully predict, that is what I love the most. ... I think I began with the desire to create worlds that follow my rules. Being the god of a digital world is very appealing. Realizing ideas is also pretty appealing.
That sounds very Molyneux of you: set up rules and watch the results without much, if any, intervention. I agree with BKrenz in that it sounds like you like working with AI behaviors and watching how new rules interact with existing systems. If I were to guess on a game style that you would like designing based on the information I have, I would have to go with the Simulation category. SimCity, Black&White, Spore, and the like. Sandbox if you want, or set goals to achieve, but ultimately it's about creation and seeing the results of that creation.
That's the kind of game I think you'd like to make.