Just a quick toot to say that I am trying to add more diagrams for this type
of puzzle to my Puzzles page at http://www.origamiheaven.com/puzzles.htm
So far I have added diagrams for Robert E Neale's Sheep and Goats and my own
Night and Day (both derived from the same flexagon) and for my Purgatory
puzzle, in which the challenge is to pass a rather large object through the
centre of a flexagon-like mat.
If you have any ideas for other puzzles which should be featured here please
let me know.