I can think of few things more exciting than receiving mail from my dear friend Ben Wu! He is both an author and an illustrator, specializing in intricate pen and ink work and macabre tongue in cheek wit. His work has a strong flavor of Edward Gorey. He has created 3 books as both author and illustrator, and contributed as the illustrator for a fourth. When he sends cards not only is each card a work of art on its own, but he makes sure that the envelope matches in frame-worthy craftsmanship.
His books can be found on Amazon:
And Prints of some of his cards can be found on Esty.
(As well as contacting him to do commissions.)