Jungle with a treehouse imbedded in the jungle made of jungle planks and logs. If I had the materials I would build that!
3d swords. You need black, brown and grey wool, diamond, iron, gold, stone or plank blocks and lots of time.
Hm. Why not. how about a gigantic tree, like a mega jungle tree, only just much larger, then just make a jungle biome around it, including the normal trees within a normal jungle biome.