The champion icon should match with the skin they have.

I usually like to buy silly skins such as Lollypoppy or SNOWMERDINGER (Those turrets XD). Killing players with those skins and actually see the original champion icon is just sad. You know, when I get someone with Snowmerdinger, It would be nice to see the artwork face of that skin I bought.

Imagine all those pretty matching champion icons :) Players playing with a combo skin like Tango Evelynn and Tango Twisted Fate