I think it'd be really cool if we could have a jewelry-making skill that would let us use a combination of different kinds of metals (Maybe even a knew kind of metal that'd be like gold) to make jewelry that would give us certain bonuses, we'd only be able to wear a certain amount (Based on a skill maybe?) of jewelry, and the jewelry would give buffs like lowering loss of energy by a bit, or making certain actions easier to do/quicker/more profitable. I can think of dozens of things the jewelry could do, even speed and jump boosts would be cool, or a quoin multiplier increase.