Champion skin

A Champion Skin (or just Skin) refers to the color scheme of clothing and other physical appearance of a champion.

List of Skins
In League of Legends, different skins for champions may be obtained by multiple methods. Two exclusive skins will be available through the Digital Collector's Edition of the game. Two more will be available through the retail purchase of the game. Others can be unlocked through riot points.

Collector's Edition Skins

 * Goth Annie
 * Silver Judicator
 * Human Ryze
 * Black Minotaur

Special Events

 * PAX Cardmaster (PAX 2009 Attendee Skin)
 * King Rammus (Closed Beta Testers Skin)
 * Pink Tristana (Unreleased Facebook Fans Skin)

Purchasable Skins

 * Mercenary Katarina
 * Freljord Ashe
 * Emerald Taric
 * Rusty Blitzcrank
 * Sasquatch Nunu
 * Nightmare Cho'gath
 * Kingpin Twitch
 * Shadow Evelynn

Unreleased Skins
According to Marc Merrill, they have a release date of December
 * Ghost Fiddlesticks
 * Ghost Gangplank
 * Panda Teemo
 * Grey Warwick

There will be another two skins given as a reward through a reference program announced on the 12th Newsletter.