So I stumbled upon this biome not too long ago, and it'd happen to be the one I'm currently settled in. I chatted with Bluestone about adding it to the wiki, and the only thing missing is a fitting name for it. Pictures were taken several days ago, but I just got around to making this post since I decided crowdsourcing might be an effective strategy here.
To explain things a bit. At first glance, the biome seems like generic lumberwoods, but on closer inspection you can see that the colours are in fact reversed, rather than being brown with green "splotches" on it, it's green with brown splotches. I've currently only found the biome a bit into the darkness, so that's something to keep in mind too.
Also, I found a waterfall.
This biome is pretty strange when you get down to it. As you can see in the above picture, it isn't relegated to a single type of tree like the coniferous forests, but has all available types squeezed into one biome, much like plains. They're also not very packed together, which makes it a lot more like a darker, wilder version of basic plains and prairies. However, a lot of the grass you see on the screen is, fake somehow. Unpickable, uninteractable, only by using Ender's or APX's can one easily distinguish between them, (though there is a slight colour difference). You can also find Waxing toadstools, Lavendar blewits, and Witch hats. TONS of witch hats, everywhere. In fact I'd say that Milkweed and Witch hats are probably the most common spawning herbs here. There is the occasional thorn bush, though not nearly as common as Badlands. Here's where things get a bit stranger, though.
There's all sorts of little plants I've never seen before, all over the place. Like the fake grass, they're uninteractable, but they're still pretty interesting. From wandering around staring at the ground a lot, I've found ones like the above picture, which I've dubbed "snakebulbs" for their shape, smaller versions of them which appear to be 3 babies sprouting out of the ground, a lot of root patches jutting up wildly in spots, as well as a plant that looks similar to aloe vera. I can upload pictures of all of these later, if you guys want.
All in all, it's been a really neat biome for exploration, with a lot of potential coolness in it. That's why I'd like to give it a neat name, so let's see what you guys can think up.