In the presentation I went to yesterday, Jeff Taylor mentioned that the staff at Eons had just given him an office, but that he didn't know what to do with it. He said his office at Monster was five comfortable chairs and a coffee table. Now that's an open-door policy.
Think about what you use your office for. In general, leaders need to get out of their offices more and go work with people. Very little leadership happens in your office. These days, it's not totally clear that leaders need one. Laptops are portable, files are on-line, and we all have cell phones. But, there is no need to be extreme.
Take the lessons from Taylor: Be accessible and work with the people.