That sounds wonderful, and I hope you manage to realize both of those packs. I'll buy them for sure. It's actually really hard to get your hands on (pixel art) battle background assets without hiring an artist directly (but that's quite pricey for a hobbyist).
Do you already have an idea of what environments/settings (and how many...ish?) you'd put in such a pack? While I assume it'd still be quite some time before you had it all finished, just knowing you where thinking about it made me really curious.