New purpose for some items

Some items have one singular use, and that’s it. Why not give them a new purpose?

Glistering melon slices- used for healing potions and that’s it. (and mundane potions I guess.) What if you could eat them for 2 hunger points (twice has much as a normal melon) and they healed you a tiny bit?

Another thing- What if you could craft chainmail armor using chains? Maybe they could be crafted using 6 iron nuggets, so they would be slightly cheaper than making iron armor, (18 iron ingots to make a full set), but are then also slightly less strong at protecting you. And maybe they could have a better enchantability level, so that would be another bonus to them. 

What other items need another purpose? Comment them \/