With the recent Echoes of Doom patch, many new emotes have been added to the World of Warcraft. Have you tried them all yet? If not, Blizzard has updated the emotes section of its game guide to include them.

The list also notes which emotes are animated and/or voiced by your character. There are currently 102 animated emotes and 59 voiced ones.

If you haven't done it yet, try /cower. It's hilarious on a gnome.