I have combined two of my experiments into something greater than the sum of the parts. Or at least, pretty close to equal to the sum of the parts. The height map explorer from a couple of weeks ago, combined with the maze from a few days ago. The combining took me all of ten minutes.
Now that I have got this far, I next need to start playing with collision detection so players can navigate the mazes, instead of flying over them.
A more technical description of this experiment can be found on my GameDev blog