One of the best books in this field is by Fukushi sensei, 'The Art Appreciation of Japanese Sword Fittings' : http://www.japaneseswordbooksandtsuba.com/store/books/b632-art-appreciation-Japanese-sword-fittings-fukushi
It gives hundreds of motifs with the origin, history and explanation. It adds so much to be able to understand what these fittings were saying to their owners as Steven stated above. Well worth seeking out.
Steven - I know we both have had such interesting journeys and hope we have many more!
BTW: don't get Steve started on Chawan! LOL I happen to have a 'thing' for chaire but I have resolved not to go there. One bad habit is quite enough!