I think a fantastic plugin would be one that randomly spawns a lootbox in the world (perhaps within specified coordinate borders in the config) and announces it in chat (preferably a fully customization chat message)
Further, it would be great if you could configure the rewards in the lootbox, or perhaps have 3 different tiers of lootbox and a chance of each occurring. This could then be added to the chat announcement saying that a more rare lootbox has spawned.
Finally adding the function for commands to be run as rewards would be fantastic.