The question is more simple than what it looks. There are many use cases that are well known and people have put a lot of thought into them. For example: Audit trailing, login users, and so on. We are looking for a good resource site that present the DB design for those common use cases.
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http://databaseanswers.org/
There are over 500 data models available for free there. It’s not hard to convert them into a working database. For some of them, if you contact the webmaster, they will send you a working MS Access application with a built in database.
Even if you don’t use Access this could serve as a prototype.