The new ranked system in League involves, among other things, emblems that can be earned. The only two I've seen thus far are for winning 3 games in a row, and playing more than 100 games. What other emblems can be earned?
There's also one called "Recruit", for when you first join a certain league:
I'm not aware of any others.
Also, since there appears to be some confusion, the Veteran emblem is awarded when you have played 100 or more games in the same league. Moving up and down divisions (i.e. from Silver IV to Silver III) doesn't change what league you are in, so this emblem is effectively for playing 100 games in the same rating tier (Silver, Gold, etc.).