Hello, everyone!  Since not everyone is a visual artist, I thought that this might be useful.  The British Library has generously uploaded these images into the public domain.  More info: https://www.digitalartsonline.co.uk/news/illustration/british-library-over-milli...

Actual images, all spooky categories. https://www.flickr.com/photos/britishlibrary/albums/72157659990533249