This was brought to my attention by a Usability & Accessibility Consultant, and quite interesting. It's basically... well, a game as an example and a teaching tool, reminding me that someone doing an Understanding-Comics-esque thing - Understanding Games - would be a noble project. It's called Game Over and each of its 21 levels - plus the actual intro screen - is designed to show an actual lesson about accessibility in games which developers can overlook. I admit, a lot aren't really that interesting, but it shows itself best when highlighting things which developers actually often overlook (e.g. Colour Blindness). You can get it from here.
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Total coincidence, but we sell some clothes