I'm a Kirby fan.
Feet of Clay
Lords & Ladies
The Last Continent
The Light Fantastic
They're all really good. I can spend ages looking at his covers. It doesn't bother me that they aren't much like the DW or it's characters that I imagine. I thought it was hilarious that he drew Twoflower with 4 eye's. I liked in The Light Fantastic when TP is describing Herrena and he says something like, the reader will no doubt cast their eye to the illustration on the cover of this book. Bloody funny.
I have other books by Craig Shaw Gardner that I bought because of the Kirby cover illustrations. The Cineverse Cycle if you ever come across them. Good for a laugh.
Smoke me a kipper, I'll be back for breakfast!