More mouth items where your tongue is sticking out, also possibly one where your mouth is open.
An item that let's you flash a peace sign, possibly an animated item.
An item that leaves one leg up, like the leg "pop"
also, possible animated item.
Also, I don't really think this is an item thing but, with our avatars there are certain positions we can have our arms in. One I would really appreciate is being able to have your arms straight up in the air, as opposed to all the sticking straight out in front of you options.