Owlbear - Volibear
Spreads his wings when charging and makes a loud hoot on his bite attack. A D&D based skin series might be a neat thought. Goblins, Beholder, Orcs ...
And another one:
Bloodmoon Illaoi - The bloodmoon skins are always themed around a red and golden color palette, with an asian look and japansese demon masks. They are always very appealing and so I took the concept and used it on one of my favorite champions: Illaoi.