For the fall, I think a horror/monster theme would be a great fit for October. If it wasn't back to back, I'd like to see comedy/silliness as an April theme. Summer, would make a good theme; deserts, storms, heat waves, weather related stuff..
Yeah, hmm, anything related to a wilderness exploration subsystem
Biomes - survival - all get shunted too often, could be a interesting thing.
Would it still be OSR?
Yeah, unless you think it shouldn't be?
No, that would be good - I like OSR!