Let's face it, nobody can code every minute of their lives without burning out too fast. What kind of stuff do you promote at the office / home office that keeps you motivated, loose, and happy?
We're setting up the office space now, and we're committed to making it as fun as possible from the start, to help offset all the stress that is sure to come. Given a budget and space restraints of course ;)
Here's our table / setup so far: http://post.ly/AkcX
Also if the thing I'm working on is mentally stimulating and challenging, it motivates me by itself and keeps me from burning out. So something like a couch to sit on or a place with a great view is good to go to and just think.
If you can put in windows, put those in. A TV would work too, and a place for snacks like a fridge.