Underworld Olaf

I think is a great champion but does not have many skins that are good. Brolaf is overpriced for what it delivers. I was thinking a cool idea would be an Underworld Skin. Every skin for him has a similar or same W and E and his Ultimate difference on skins such as PentaKill and Brolaf are barely any different. I think if Underworld Olaf were to be considered it could have cool particles such as when you use W his axes change to an underworld themed color, and or have some kind of spirit essence swirling around them instead of being electric like every other skin he has, and when he uses his Ultimate he could change into some type of shadowy behemoth, or at least glow some underworld themed color instead of red like all his other skins. What do you guys think? Would this be a good skin idea, and what cool suggestions do you think could make it appealing?