I found an interesting website the other day. It is called How it Should Have Ended, and it is about movies.
English teachers will know from the title, this website can help with the 3rd conditional.
It's a fun website that has a number of animated videos showing how the authors think movies should have ended.
The animation is actually pretty decent, and the videos are funny. More than that, the site can be used to get your students thinking and speaking using the 3rd conditional.
So check out the site, and hopefully you find it useful for your classrooms.