Heh. Well, there might not have been a choice. Or perhaps people would be disturbed by being offered one? But if you have to wear the bloody thing, then, for example, it would be nice to have a colour that you like. (It's the only way -- aside from doing a good job of inserting and removing it -- that I can think of making the experience a little less impersonal for the patient. It could also classify as "an unnecessary waste of funds".)