Somewhere around here I've got a couple of sketches I did of Betty for a local library's Halloween display years ago.  (Their AV department had that big set of Betty Boop cartoons Republic Home Video put out, with onscreen introductions by Max's son, Richard Fleischer.)  I did one of Betty as a witch, and another of her as Vampirella.  The Vampi one didn't get used, as it was felt the costume was a touch too risque' for the library.