Entity list
Make a list of entities. Each list item is a link to see the entity's deets.
Database
PDO tutorial
Here's a good tutorial on PDO.
Wombat games
Show the games wombats play.
Add a wombat
Make a form to add a new wombat to the DB.
Wombat list
Show a list of wombats.
DB dropdowns
Making dropdowns from the DB
Books app
Make an app to shows books, and authors.
1:N Lookup
Look up a category name.
Id from GET
Write your own version of the wombats app.
Supernatural accuracy
How accurate were the goats?