Skin Idea: The Wizard of Oz
Imagine if you will:
Tin Man Gragas complete with his own oil can
Cowardly Lion Rengar
Scarecrow Fiddlesticks (already basically works)
Annie as Dorothy with Toto Tibbers
Wicked Witch Nidalee who rides and throws broomsticks
Heimerdinger Oz the Great And Powerful
Winged Wukong
If you guys have any other ideas, feel free to contribute.