Nothing.
Even though I am in the reception area of our office, it's as if I have my own office.  Our offices are on the top floor of a building, looking out over the Atlanta sky line.  We are location near a military airport and aircraft manufacturer, so watching the jets and other misc. aircraft is always entertaining.  The office is decorated with antiques and is very nice.  The pictures are little dry, but still nice.

I always say I would want to work from home, but I think the food source would be too close!  Perfect hours would be 4 days on 3 off - even with the 10 hour work day.