Arky's Environment adds new plants, decorations and other things in the world of Minecraft. Unlike many mods, it will not add many of their biomes, rather the opposite will try to improve the old.
It's a mod with a simple mission - take the vanilla biomes, improve their design and overall aesthetics. While it does that pretty well, it isn't the only thing it does. While venturing the world, you'll stumble upon many new flowers that you can later use to craft scented candles that apply potion effects in an area around them. There's also some new ores and food with neat textures and a vanilla vibe.