I have created a bunch of new icons for use as smilies as well as for easier navigation and visual cues around the site. Only one of them is actually a smiley, this little guy: :chat:

Many of the icons I created by using the Webdings and Wingdings fonts. There are lots of little symbols in there that are good for making icons. I would start with one of those and then alter it's shape a bit and then color it. Pretty neat huh? I actually wished there were more icons in there because there are still some symbols that I could use.

The ones that are file types I created with the expectation that people might use them in their descriptions for artwork by saying what program they used or something. Like if they painted it in photoshop, they might use the little psd icon like this:
:psdfile:
Or if they did it in Painter, they'd use this one:
:riffile:
But I don't know if people will actually use those. Anyway, enjoy!