If you have looked closely, you, like the driver, might have noticed the different colored windows and wondered if this was a mistake of some kind. He said in his years of working for the company he'd never seen some of these colors, his experience being limited to white and beige and once in a while black. It's not a mistake, I told him, it's a design feature.
The fact is that back when I first had the vision for this little house, I had the brainstorm of using different colored windows as a cool, graphical design feature on an otherwise simply shaped little building. Here's what one of my early sketches looked like: