First up is Mike Peters on October 15, 2008:

Followed by the New Yorker's cartoon editor Robert Mankoff, in the February 2, 2009 issue.
An occasional report from Squaresville, the home of Wayno's cartoons, fine art, illustration and writing
This is my latest self-promotional postcard, the sixth in the 12-year Chinese zodiac cycle. I'm halfway through!
There are a few more images at McDrunk's blog.