Ethereal adds many new biomes, plants, food items and tweaks to your world that makes for an interesting adventure :)
Here are some of the new additions:
Biomes: glacier, bamboo, mesa, alpine, healing, snowy, frost, grassy, caves, grayness, grassytwo, prairie, jumble, junglee, desert, grove, mushroom, sandstone, quicksand, plains, savannah, fiery, sandclay, swamp, reefs, sakura, tundra, mediterranean.
Trees: willow, healing, big, banana, frost, mushroom, palm, redwood, orange, birch, sakura, lemon, olive.
Food: wild onion, strawberry, lemon, olives, many fish, banana, pine nuts, coconut, golden apple, hearty stew, mushroom soup, firethorn jelly, sushi, teriyaki.
Special items and features: potion of flight, crystal tools, staff of light, gilly staff, a working fishing rod, cold blocks freeze water, hot blocks melt snow and ice, torch drops near water.