These models all look beautiful man, very good and perfect for any swampy horror scene; they could even be used, if done so correctly, in some sort of run-down, filthy city. I can't wait to buy them and see what wonderful environments I can design.
The breakable components sound awesome, they could definitely be used for some puzzle elements, and if you do choose to make some sort of water decal, even if it's simply a large, murky puddle of grim mire - it would be wicked.
Another suggestion for the pack might be a few entities that could go along with the swamp; by which I mean, perhaps old rotting cars, building ruins or other things of the sort, to give the sort of feeling as if the swamp as gone and swallowed a small village or town that was once built upon it. And with the foliage you planned, some of them could be possibly designed to wrap close up and around the village entities to show the swamp almost taking back the land, knitting itself back together around whatever objects sit in its way.
Just a suggestion
Amazing work as always though, can't wait to see more; and can't wait for the packs completion!
-Cheers
Ich will in Beifall untergehen.