The Cross House
The two images below are instructive.
In both images I was standing in the same place. In the top image I am looking south, and north in the second image.
The top image is how the Cross House looked when I purchased it. It had been painted in a blue-ish gray.
The second image shows the house in June, 2014. After some effort, the original colors were confirmed, applied, and that is what you see.
What surprised me was how, by going back to the Default Intention (the original colors), the substantial limestone foundation (a highly prominent aspect of the house) looked, well, better. And the stained-glass windows also suddenly looked better. The oak front doors suddenly looked better, too.
So, I kept circling from south to north to south to north and so on, and was amazed. As such, my advice to anybody owning an old house is: press Default. You will not regret it.