Here are the ones I own:
There are a few others I have, that I couldn't find images for online. The classic, of course, and probably my favorite, is the one drawn by Edward Gorey, which he did for the first United States version. The top one, with the illustration by Arthur Robins, freaks me out a little since the illustrator did the drawings for What's Happening to Me, the book on puberty my parents gave me when I was, well, hitting puberty.
Here are some I don't own: