Quick note on this... I try to add a lot of 'em, but I *have* been sticking to the same style set on these. If you google for smilies or search around for sets of them, like I have, you'll find a lot of em in slightly different styles, or made to be larger, or etc. This kinda breaks the spirit of the smilie family. I think it's funny that they are multi-racial but for the most part only one species.
vbulletin itself introduced a gradient to the basic smilie which broke the notion. But it wasn't too bad
eek has migrated from this
to this
...which is a great one.
And this pair

were always "different", but so worthwhile that I added them anyway. So I guess if you suggest smilies keep em in the familiy, so to speak.