Some have simple one colour blocking, such as The King in the Golden Mask by Marcel Schwob:
While others have a design and lettering in one colour, like Clarimonde by Theophile Gautier, The Snow-Image by Nathaniel Hawthorne, and Herald of the Hidden by Mark Valentine:
The nine Aickman volumes all have similar typography in gilt and silver. Here are Night Voices and The Attempted Rescue:
Rupetta by N.A. Sulway had a very restrained little silver clockwork key device:
While Star Kites by Mark Valentine had two colours with more exuberant silver, and ocassional little stars added in gilt:
Dear Dead Women by Edna Underwood had gilt and silver blocking, but with a more traditional, ornamental design:
We went for three matt colours for Darkscapes by Anne-Sylvie Salzman:
And then, of course, we went to town with three colours on Sourdough and Strange Tales IV