[Idea] About champion mastery

Hey guys, I don't know if it was already in your minds but if would be really nice if, for example, when you achieve to get the highest rank at the end of the month with a certain champion you could win a special skin (or just a summoner icon).. or at least the top 10-100

I'm sure this will motivate a LOT of people achieving the highest rank with their favorite champion !

What do you guys think ?