I always said that if I would start up a company I would paint every wall with chalkboard, especially the bathroom walls. I would also make a ball pit and have 'flexible' desks. That means everyone gets a desk and a laptop but are free to move as they want. Meetings should not be held in some room, but in the open. PM's should sit next to the developers and managers should know people's names. But as you might notice, most of those things are not something you should buy, you should create an atmosphere of innovation. And that is something that is only possible with open-minded people, freedom, flexability and happyness!