Here are instructions on how to make icon sets and buttons. You don't have to do both, one would do just fine.
Something I'm in need of for this theme are buttons.
To create buttons/icon sets:
1. Download imageset.zip/imageset.7z
2. Unpack and start replacing files, make sure the files are in the correct format and size.
3. If you intend to do Guild Wars icon set you might find monk.zip useful as well as these icons from guildwars.com.
4. Upload them here and await feedback, modify as decided (upload via second tab under the text box).
5. I'll upload the files to the server and make the icon set selectable
6. Thanks for contributing!
You can also add suggestions on what kind of buttons and icon sets you would like on the forum and other might create it.