The Wonderful Wizard Of OZ
It is pretty long but a remix story of it wouldn't have to be.
I think it would be fun to do in a hip hop style or at least really modernized :)
I think this would be a fun choice because it is very visual and a lot could be done with animations and drawings for backgrounds/landscapes. I also think it would be awesome to place the story in present day or even in the future (maybe a robot as the tinman?) This story is super well known but hasn't been done to death by Disney or TV shows...at least not that I can remember. :)
Public Domain Image