I know that a lot of people don't actually know about this, so i'll post it here: http://na.leagueoflegends.com/en/pag...-up-pool-party
Play any gamemode as a 5 premade team and gain points towards different rewards for the whole community. You can see the progress bar so far, we need to at least get to the icon and mystery champion, then we gotta get the mundo skin. o3o