More potential ideas- comment below

1. This might just be me, but I'd love to see an actual performance of Twinkle Towne from High School Musical. The movie had sort of an outline of what it might be with various props and the two songs.

2. Noises Off was a stage play before it was adapted into a 1992 film starring Michael Caine, Christopher Reeve and Carol Burnett. But if you look at the script for the stage production there's actually a play-within-a-play called Nothing On. There's only one act at the moment but I think there's a ton of potential there if someone could write down act one and write up a concluding act. 

3. I don't know if anyone's read Short Plays for Young Actors but there's one called The Pot Boiler, where an established playwright shows an up-and-coming playwright his newest (unfinished) play during a rehearsal. I thought of two ways to expand on this short play- (a) write it into a short film and (b) write out the play-within-the-play and try to resolve the conflict. 

4. Actually any of the plays in the Short Plays for Young Actors book could be adapted into short films.

5. Disney+ adaptations of Carl Hiaasen works like Flush, Chomp and Scat. For the purpose of including as much as possible from the books they should be adapted into one-chapter-per-episode series. Hoot has already been adapted into a film starring Logan Lerman and a very-pre-Captain Marvel Brie Larson.

6. Some John Grisham books like The Rooster Bar or The Firm or Ford Country Stories would be fantastic TV series adaptations, although most likely not on Disney+ due to some of their material. Maybe Netflix or something like that?

7. There was a stage marching band/dance ensemble production called Blast! that had a London production back in 2000 but hasn't toured for the past couple of years. An idea that I had would be for a new generation of Drum and Bugle Corp members to perform the original numbers from the London show and be overseen by some of the original cast members. The show could be titled Blast!: Next Generation.  

8. A Garfield spinoff/prequel strip series focusing on Garfield's childhood- it could be titled Young Garfield.

9. A spinoff series set twenty years after the 1995 film The Big Green where an exchange student from Manchester, England introduces the current generation of kids in Elma, Texas to soccer while the Knights from nearby Austin have won national travel titles in all but six of the ensuing years.

10. I might've posted about this before, but an actual hardcover version of Hogwarts: a History. Just think, it could go from the hardcover version to a TV series. I do, however, think it goes without saying that someone other than J.K. Rowling should put it together.

11. A trip back to the Keaton School of the Arts first seen in the Canadian 2016-17 TV series Backstage.

12. A TV series set at Winter Park High School of Paper Towns book fame and following ten exchange students from ten different countries- five male and five female. 

13. A book or something detailing what happened after the final Calvin and Hobbes strip. What became of Stupendous Man and Spaceman Spiff? Did Susie continue playing lacrosse? Did Calvin and Susie attend high school together? And what about Moe? 

14. In that same vein, maybe some Calvin and Hobbes spinoff comic series- one about Stupendous Man and one about Spaceman Spiff.

15. I had some ideas a year or so ago about what Pearls before Swine could do in terms of multi-day arcs. The first involves Pig's basketball team and the basketball team Rat coaches prepping for a game against each other with the winner advancing to The Basketball Tournament; and the other would involve Rat bringing back his pro wrestler persona as he's been given an opportunity for a win-and-in match to make the WWE roster.