League of Legends needs the Heroes of the Storm skin preview function.

Heroes of the Storm has an awesome feature that allows you to preview the skins before you play them. With LoL, we've always been restricted to watching Youtube links of the skins, watching others play them, or getting in to the PBE to test them out. I feel it would be a smart move to implement this feature into LoL. Allowing people the option to test out a skin in a small bot game may lead to increased sales in the skins.

I know that personally I've had so many bad experiences with impulse buying, that I research everything beforehand. I would be more inclined to buy something after having first tried it out myself.