Where have all the artists gone?

What do I have to do to find a graphic artist in the OSS community? Where do projects like Gnome, KDE, etc find these people? In the few projects I've worked on, there's been no shortage of people that are willing to submit a few lines of code in a patch, or actually become a developer on the project by submitting more than a few lines, but graphic artists are few and far between. In Exaile's history, there have been 2 or 3 people that have submitted art, but only a few pieces. The rest of the art is derived from these few pieces; put together by other users and contributed as a set. I've looked for artists, and found some, and even offered to pay others, but it's hard to get anyone to follow through.

I wish I had the talent myself, but I've tried, and I just can't work it out.

Why does there seem to be such a lack of this skill in our community? Am I the only one that has this problem? Is because graphic artists actually do choose OS X as their preferred operating system? What gives?