"True" Champion Mastery

Once you get to Mastery level 7 on a champion, Ranking S+ will give you Champion Icon Shards. Combining 4 of these Shards would create a summoner icon of the champion's Portrait. (Maybe take this as far as a random Portrait of any of the champions skins)

Just an Idea I had, give players another way to show how well they can consistently play a champion.