The file "examples-1.php" is the default layout, which you will see, when
you first run ewiki. The examples/ subdirectories now holds further example
'ewiki wrappers' or 'layout scripts' (commonly referred to as "yoursite.php"
scripts in the README).

There is not much further interesting stuff in here. If you can make a
contribution, just do (however, in the ewiki core tarball, we don't want
an image or graphics directory).
prev << "tools/collectplugins"
next >> "examples/homepage.php"

You cannot modify the README.fragments file, but anyhow any ideas or suggestion should as usually get filed on BugReports, UserSuggestions or even better the README.fragments.Discussion.