Thanks!
The whole point of these, though, is that simplicity/universality so you can really put whatever disc of that movie you want in the case, so the lack of any description on the back is intentional.
But if you (or anyone else) would like to add some description or special features or anything themselves, by all means! These are already tweaks to existing covers, I feel no ownership over them. If someone wants to use them as a starting point, go for it!