(No idea if this is the right place for this, but here we go.)
For a Justice League movie I think it would be cool to make it lean a bit toward a comedy. Not slapstick, but light enough to break the mold of the current dark superhero thing.
I'd like to see a "mature" Justice League in the Silver Age vein. But no Super Friends, and no Nolan-verse stuff. It obviously would never get made, but some Photoshopped pics might be fun.
I'm thinking ...
Bruce Campbell as Superman
Patrick Warburton as Batman
Demi Moore as Wonder Woman
Mark Valley as Aquaman
Richard Burgi as Green Arrow
Coby Bell as Green Lantern
This is just for fun, and casting can go any direction.