I did read The Hunger Games before I read the movie and to my knowledge the cover has not been redone since the movie was released. Same for the two subsequent books as far as I can tell. This is a plus I'd say because I like the simplicity of the original cover.
If the cover were redone, I imagine it would be similar to the movie poster shown below. As much as I love a good expressive book cover, I don't much care for pictures for some reason? I think it's striking as a poster, but the book just leaves a little more to the imagination.
I haven't seen the Fault In Our Stars movie but I have read the book. Definitely prefer the original book cover.
It's not that I don't like the newer covers per se. I think the one for The Fault In Our Stars is actually nice. I think in general I just prefer the subtlety that books offer. There's just something alluring about alluding to what's inside a book without actually showing it to me. At least these books anyway :).