I think a Krampus themed skin for Rengar for the holidays would suit the spirit of his character. Rengar needs to be included in the holiday themed skins while maintaining his fierce strong beardy style! What do you think?
He sees you when you're hiding~
He knows when you're afraid~
Santa isn't coming this year, So run away for your own sake!
Krampvern 
is coming to town . . .
oh I also forgot to mention Krampus isn't the right fit for Rengar because Krampus still must deliver mercy to the good but looking into dark lore for Christmas there is a creature known as the Yule Cat
A huge and vicious cat said to lurk about the snowy countryside during Christmas time and eat people who have not received any new clothes to wear before Christmas Eve -Wikipedia
so in conclusion, Yule Rengar would be a better skin thematically then Krampus Rengar
