Sorry I was on a hiatus. yesterday I was out and about and the day before i slept in because I was sick. But I'd suggest a boundry between biomes; Perhaps with a river or lake too.And if possible, a necro tower. everything else is up to he who starts.
I agree with the boundary biome - seems like a good solution. Though myself I wouldn't recommend being near a tower unless you want to risk a group of pyromancers being present in it and "visiting" with a group of firemen (I can speak from experience that it'll lag the entire thing up and devastate most of the landscape).
When it comes to the WC creatures, savage tropical biomes (mostly forests) tend to be inhabited by some of the dinosaur-type creatures - devilsaurs, raptors, skyscreamers and the like.
Savage wetlands also have a lot of plant-based creatures, i.e fungal giants, bog beasts, spore bats. I'd imagine infections would prove to be an issue - also if Enemy post added the plants from my pack as well you'll see aboveground giant shrooms (zangar-caps), so I guess if you wanted wooden furniture in a light blue colour that'd be fine as well.
Savage deserts have some of the aforementioned dinosaurs, alongside some large insects like the ravagers and the silithid. Also thunder lizards which are more or less kodos with lightning breath.
Lastly, savage icy biomes (tundras and taigas, glaciers also) have some nasty beasts as well - sort of a mishmash of the other biomes - you have gargantuan worms called jormungars, arachnatids (basically large scorpion-type insects), crystalline tenders (satyrs and dryads made out of a stone-like material), amongst a few other creatures. You'll also see light blue crystalline trees, which IIRC I made a bit more dense than regular ones so they could actually be useful for blunt weapons.