Hextech trading.
I personally think that Riot should implement a trading system for the hextech loot. Say you have a skin shard that you can upgrade to permanent for 1520 orange essence, but you don't own the champion or you don't want the skin. But you have a friend who wants the skin. We should be able to trade them, so you would give that person the skin shard, and you would get the 1520 orange essence for it because they are upgrading it to a permanent skin. It would be a cool way to still be able to collect skins, but to also be able to trade with your friends. Skin shards, champ shards, emotes, all of it should be tradeable. I know I'm not the only one who thinks this would be a cool idea.