Do you mean replaced hollow doors with different ones? What would you want pictures of?

I just saw that you said 'hack'. So somehow somebody converted one into the other? I can't see how you could add wood to the door and it would still close. I think this 'hack' is probably more expensive and more work than just buying different doors.

The material and time would far out weigh the $100 or so to buy a new masonite door.

Thank you!

There's many Youtube videos and other information on the web for doing this. I think it depends upon how many doors you need to modify as well as the style you're going for - as the trim would be much less to buy.