Biodegradable smart earrings harvested from papaya enzymes. Contact-charge your phone or earbuds through your ear. No cables. No power banks. Just tap and charge.
Your phone's at 3% and you're at a festival. You tap it to your papaya-wood earring and watch it start charging. The wood grain glows softly showing power flow, your friend asks where you got that stunning earring, and you realize you'll never carry a charging cable again.