There are some do-it-yourself options, however. This Fast Company article recommends placing a piece toilet paper in the bowl. A regularly used hand dryer could also provide enough white noise to mask any unfortunate noises.
If all else fails, such little amenities as a basket of free tampons or mini-mouthwash can make all the difference for bathroom goers. Or the creativity focused office, like this one from Adaptive Path, might add plants, toys, or art projects. Then again, things can go too far in the contemporary office, where every space is designed for maximizing productivity. Adaptive Path also has "collaborative" and "participative" work in its office restrooms.
Some spaces should stay sacred.