(In)Side Business Opportunity: Modding Microsoftie's Offices?

I've joked about this for a while, but I'm starting to believe there is a business opportunity making office modifications to Microsoft employees -- particularly modifications that are within the Real Estate and Facilities guidelines. For example, if you don't like the color of your office, we can change it -- and change it back when you move out. We can change the lighting in your office to something less awful than the standard flourescent tubes, yet still energy efficient. We can steam clean your carpets and add an air filter to the air conditioning outlet in your office.

What do you think? And how much trouble could I get into? ;-)