I'm a graphic designer and web developer. I realize that the mission of XFCE is to provide a light-weight user-experience, but I find that all themes are unattractive. If I wanted to contribute to the artwork side of this project, where could/should I start?
I found this site; http://goodies.xfce.org/contribute
If you dig a bit deeper after the contact information, there is a section on artwork.
Hope this helps.
Best to join the goodies mailing list and work on xfce-look.org. If you have a nice theme and its not based on a non-xfce theme engine, we can include it in the xfce gtk engine or a new theme in xfwm4; but the best place to discuss that is on goodies-dev ml.