Don't forget the multiquote button:
![](http://www.oddworldforums.net/images/buttons/industrial/multiquote_off.gif)
e: Although I like
![](http://www.oddworldforums.net/images/buttons/industrial/lastpost.gif)
as it is. It fits the colour scheme, it stands out well enough from the background to do its job, and there's not really anything Oddworld-y I can think of to replace it with.
You can't have every single icon in the skin Oddworld-themed - sometimes it's best just to keep them simple.