pool party sivir?

How about pool party in a lifeguard outfit? She could throw a lifesaver for her q that bonks people on the head! Actually, to add to that thought, she could be holding a lifesaver with a rope for her skin art or something.

Edit: My friend suggested that she could have a whistle -- she blows this whistle when she ults and possibly gives everybody a watery aura in addition to the movement speed?