OP Skins
I have always said you should get a skin for getting a penta kill on a champion, and for a while I just wanted them to make a "pentakill" skin for each champion, but I understand there is a whole lore around the pentakill band, however they could do simple skins for each champion, and name it the Op skin series. You get a pentakill with Viktor in game and unlock "OP Viktor"(or whichever champion you get the penta on) and it could/should be just a simple skin, that is otherwise unavailable.