So, I must be some sort of ancient fuddy-duddy. It is true that I went to college before the internet was really a pervasive thing like it is today, but there is not excuse for not executing some simple searches of likely places.
Of course, on it there is a link to their list of surfaces:
Now I just have to sift through and pick some examples to show off to the students. I have a few to add of my own that don’t appear on those lists exactly. Hey, that gives me an idea!
Students could improve some wikipedia pages as a way of sharing their work. I have never done that. Has anyone tried that? Is it plausible as an assessment?