League of Legends (earlier known as League of Legends: Clash of Fates) is a free team based action RTS online fantasy themed game. It's developed and published by Riot Games for Microsoft Windows and Apple OSX. For each match in the game you get to choose a champion to play and also (if you have unlocked), choose between a number of skins for the selected champion..
Here you can find player contributed suggestions of LoL team skin themes.
And finally the we have the new and beautiful FIFA World Cup Brazil skins to view.