Aw, I happened to have liked the /snowball emote a lot...
It made things a little more playful and it helps gets the attention of players who are "Ninja AFK". There was an instance where I was running in Gridania, from the Adventurer's Guild, and a player I didn't even know started tossing snowballs at me and another player (whom I did not know). It was fun teaming up to pelt him back for a brief moment before waving and running off. I liked that.
Speaking of emotes... the aspect of the Snowball getting "Ninja AFK" players' attention, I think we should actually have a specific emote that makes a (somewhat) loud noise. Maybe </whistle>? Uses the same sound as PUG's <Taunt>? Yeah... I think we need that. Lol.
Edit: On second thought, for </whistle> make an exclamation mark jump once at the top of the person's head so that they know that it was them who's being whistled at. Kind of like the snowball splash.