He makes gifts of scarves in hideous colours as passive-aggressive statements. (Oh, how.... thoughtful. It's very soft. And warm too. Very soft and warm. And well-made! Don't say anything about the colour, don't say anything about the colour, it's a blind guy, of course he can't tell what colour it is, you can't mention that.)

Revenge scarves. They may only have to wear it once- but he can taste their embarrassment.