Nuno Pinheiro, Danya (from Flat* and Monochrome iconset fame) and Robert Wadley are working on the KDE icon set for OpenOffice.org (beware, this page is a hefty download and also a bit outdated I was told). We now see artists stepping up to work on al sorts of artwork stuff lately. Derek Kite of KDE Commit Digest fame asked for help on a new lay out for the Digest.
But of course we have more famous artists. Bastian Salmela (Basse) created these cool Konqi models for KDE and Kubuntu. We now even have a cool Konqi animation. Everaldo recently released the breathtaking Crystal Clear icon set. And don't forget Kenneth and Torsten who are also contributing artwork to KDE for a long time now.
Nowadays it seems that more artists are involved. The KDE-look.org website (kudos to Frank Karlitschek) and KDE-Artists website (thanks Janet) are really great! Just watch the Kollaboration forum to see how artists and coders are working together.
So artists of the world ... unite! Build a sophisticated graphic design onto this great technology called the KDE desktop!