Elementalist Ward Skin
So, when Elementalist Lux was released, a lot of existing champions and their skins got asigned an element that effects Lux's quote whenever she kills them. Currently, the Ward skin only has effects if you are using the skin, but it would be neat if it used the effect of the skin's element that you happen to be using.
Here's a list of the hidden Champion & Skin MetaData for skins at the time the skin was released.