sticky arrows are the idea of a sticky ball on the end of the arrow.
uses: hit animal, the animal is covered in slime and is stuck in place for a while.
hit ground, cover earth in slime making a green looking snow on the ground that slows you way down.
TNT arrows, this is pretty self explanatory, hit something makes explosion (Note, explosions is smaller than normal TNT)
Uses: kill a lot of Mobs at once
make smaller TNT holes
uses: hit animal, the animal is covered in slime and is stuck in place for a while.
hit ground, cover earth in slime making a green looking snow on the ground that slows you way down.
TNT arrows, this is pretty self explanatory, hit something makes explosion (Note, explosions is smaller than normal TNT)
Uses: kill a lot of Mobs at once
make smaller TNT holes
There are more ideas you can make