I wanted all my snes box art in emulation station to be the same size and orientation, and to replace ugly box art when applicable, so I've built up a collection of alternate art from a million different sources. you can DL it and pick and choose stuff from it if you want.

https://drive.google.com/file/d/1G7oJ32R-KDgWLDpjier6m5TPladGz4t0/view