A while back, while working at the WordPress plugin course at Treehouse, I came across this awesome plugin from Daniel Convissor. The Object Oriented Plugin Template Solution plugin basically gives you an OO template for building your own WordPress plugin.
I didn’t end up using the template in the project, however, it was very helpful to look over and learn from. I encourage new plugin developers to check it out when you start your next plugin!
WordPress Educator Zac Gordon 
I think the subject of OOP in WordPress is a great candidate for a course.
-pkd
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They have it for a PHP course, but we probably wouldn’t tackle it as it’s own WordPress course 😉
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