Could There Be A Mastery Orb/Chest For Getting Masteries 5,6, And 7?

So I've been thinking that it would be pretty cool to get a capsule/orb for reaching at least masteries 6 and 7. It just seems like a good reward for getting mastery on the champion. The capsule/orb could contain skins for the champion, an icon, random epic or rarer skins, etc. It just seems fitting for a reward because you don't really get anything for ranking up in mastery. Any thoughts on this?