Ashe buff (passive)
What would you guys think if Ashe had an addition to her focus where she gets X movement speed everytime she crits? It has decent synergy with her current passive and scales up to being a good teamfight passive as the game goes on (gets more crit). Counterplay to this passive would be if a champion gets within X amount of range she would lose this movement speed and can only get more of it if she gets more distance between her and her opponent. It fits Ashe's theme of being a frost archer (relying on kiting) and also makes sense on her passive (It's hard to focus when someone is in your face).
Some changes could be X movespeed each crit stacking up to X amount and starting over if you don't get a crit wtihin its X duration. If it's necessary could remove the +3 gold per unit kill on hawkshot to remove a bit of power that doesn't really add anything to her kit.