Riots Generous Giveaways

I was wondering if anyone could give me a list of the skins and the other giveaways Riot has done at many events worldwide. Some examples are the Pulsefire statue they gave at the 2013 World Championships at Shanghai and others include skin giveaways like Arcade and Riot . If anyone could help contribute to this post by listing and skins or items they gave away it would be greatly appreciated. Good luck in your upcoming games. Thanks for your time! :P