Im honest frontier could hit us with any scenery theme they want and it propaply be dope. Looking back at the scenery themes, the piece quality has only gotten better over time and the conservation and twillight pack have added some of my favorite pieces to the game so far. I cannot understate my love for these two scenery themes, as the first got so much usefull random stuff to throw around back stage areas and gorgeous plants and wood pieces, while the latter has great wood, stone and added nicly to our european foliage selection, with the door and chain pieces being particular favorites of mine. Id say im building rather unthemed grounded zoos and i made good use of both packs so im all open for more scenery packs and themes. For things i would want, id be most interested in an education themed set with many single props like the conservation set providing educational items to build nicer viewing areas and custom signs, with a canid, suid, bear, crocodile and panthera skull, aswell as a tortoise shell being at the top of my list of concrete things i want.
Another thing id love would be a cabin theme. Horizontal log walls would be amazing and are quite common in both low and high theme areas, but my real desire are hunting and poaching related pieces, like deer antler, bear traps, animal furs, rusty cages, etc as from my experience quite a few zoos also offer education about poaching, both in the distant past and the present and id love to replicate that in planet zoo, so while a poaching theme might sound weird id be all for it