Payable extras to champions

Looking at the chroma idea I was thinking a better alternative would be to all people to pick extras they would want on a champion beyond color and all for full customization.

There are certain skins that have really cool features, particles, and the like however the rest of the skin you don't like. So why not have specific payable taunts, jokes, dances, weapons, armors, recalls, particles, ext payable in RP?