50 Watts has a gallery of Philippe Caza's early work. Caza writes, "I was a great fan of Moscoso, Crumb, Griffin, and some other US underground comix that I could find at one bookseller in Paris."
I think his work is also reminiscent of Heinz Edelmann, the Yellow Submarine artist, and Peter Max.
Caza posts his recent (and excellent) work on his blog (which is in French).
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. His new book is Maker Dad: Lunch Box Guitars, Antigravity Jars, and 22 Other Incredibly Cool Father-Daughter DIY Projects