So far, I've finished one side of the house (but not the chimney, I'm saving that for tomorrow). As we're all still sick, I decided to call it a night and save the rest for tomorrow morning. I mixed a tan grout and, after floating, removing, drying, etc etc etc, I went over the area with a combination of pastels. I used a medium gray wash, followed by another orange-y wash. Then, I added "dirt" in the appropriate places. Pre-pastels, in certain places (namely the concave corners), I did another "dirt" wash with watered down grayish brown paint. I hate how grouting leaves these bright, clean-looking crevices!