Gary Panter's commissions are easily arranged through his website: http://www.garypanter.com
Now, Gary's commissions are not the norm. He works with the keywords that you provide to him, and off he goes! I arranged for three such pieces with Gary. One was so-so, but the other two are just excellent! For one, I provided Gary with the keywords "Philip Guston" and "George Herriman", two of my favorite artists. Here's the piece that he came up with: http://qurls.com?i=2847
The other piece turned out very differently. I asked Gary to work with Marcel Duchamp's "Nude Descending a Staircase", one of the seminal Cubist paintings, and Popeye. Here's the resulting drawing: http://qurls.com?i=2848
I love both pieces equally well, even though they're so completely different. Gary was excellent to work with.