streamer cards
Streamer cards (like twitch ambassador dangheeseling does) but across the entirety of twitch, so you can collect cards from your favourite streamers for gifting packs and be able to exchange and collect cards with other communities across twitch. Would also be a great way to showcase supporters of your community by unpacking their cards and showing how has supported. Could be generated with a small clip (like moments) of their support at that time or a screenshot rather than needing lots of custom art, or a showcase of the channels emotes which make up the cards which can be collected for that streamer and a random one is given.
I don't know how twitch would wish to implement it but obviously it's a great idea and works well for the named twitch ambassador and would be great if there was a way to incorporate it across the whole of twitch for all channels.