Rewards for reaching mastery rank 5?

OK this has bothered me for awhile, the recently (ish) implemented champion mastery system gives you nothing but a shiny ribbon for working to master a champion. I do like the system don't get me wrong it's a step in the right direction, but I feel a shiny ribbon and an emote aren't much for the time it takes to master a champion. Maybe unlocking a skin, or possibly making the splashart animated, or at the very least a summoner icon to go along with the current system I personally think would be rather cool. Well thanks for reading, poll your answer down below. Have a nice day and best of luck on the rift.