There are a lot of items on minetest that are in need of craftablitys (not a real word, but go with it).
Jungle Tree: I don't see why you can't craft anything out of jungle wood. It should be able to be crafted just like the regular tree.
Jungle Grass: Other than a lawn decorative, not much to craft out of. So I say maybe a straw mat or rope.
Leaves:At first it was not much to bother with, until the sapling was introduced. Now I've chipped away a lot of leaves and have no idea what crafting idea that could be done with them other than compost.
Cactus: erm... medicine? to restore your health slowly. i dunno.
I just wanted to get these out, mostly the jungle tree. At some point they will be set up for crafting, but I figured we discussing them now.