"Research Integrity" Series book cover design graphic design book jacket http://www.chengtsung.com/ http://www.flickr.com/photos/lasicfan/
Google Image Result for http://lovehousedesign.com/blog/wp-content/uploads/2011/09/9781844087600.jpg
I'm having trouble playing with the lines for my 2nd idea... but I think this shows some good examples of what I could add to my lines to make them look more playful.
Russian Book Cover Illustration
Book Cover Design
Murakami Book Covers by Celia Arellano, via Behance
Zimnik, Reiner: Jonas der Angler. Zürich, Atrium Verlag, ca. 1965.
Marshak - Lebedev, via Flickr.