Oticon used to do a set that was either half purple/ half orange, or half yellow/ half blue. They could do either side, so if you got a set, you'd get the outside in one color, the inside in the other. So if you had the same loss on each side, and you wanted to switch colors...all you had to do was switch earmolds. This was brilliant, and where were all you adventurous users? I don't think we sold a single one at our offices, but then, I have a hard time persuading parents that their 3 year old should have color, much less convincing the 23 year olds.