These were all in an old pocket sized notebook I used to carry in my pocket at work. I was doodling out ideas that would become Pan-Gea and other stuff I'm working on. I have a bunch of these little notebooks with little ideas and sketches in them I've completely forgotten.
Looking back through old sketchbooks I usually find something I forgot about that revives some crazy old idea. It's refreshing when you're able to inspire yourself by surprise.