Smiles
I'm actually very surprised to see w:Template:Smile is not included in the default configuration. It's got to be the oldest and most frequently used of the WikiLove templates on Wikipedia. Other than that, I think the WikiLove extension is a great addition and enjoy using it.
Then a new category of WikiLove messages should be created, as it does not fit in Barnstars, not in Food and even people who did not pay attention to biology lessons, would see that w:Template:Smile is not a kitten. It's IMO a good idea to put a new category "others" in, in which admins can add new messages.
I have another suggestion: why not add the birthday templates listed at w:en:Wikipedia:Birthday Committee? The calendar there shows that every day lists at least a couple users who have shared their birthdays or anniversaries. I'm sure wishing others a happy birthday is a great example of WikiLove.
