I recently bought "PHOTO ART" by Worobiec & Spence, and found it much inspiring. It does give some information on alternative toning processes [FSA etc], hand coloring photographs and combining photography with other arts. It does not stop there though, as the whole book is devoted to extending ones view on what can be done with photography. Anyways, i think it's a great book and a good read for those who wish to experiment with their photography.
You can also find an article on hand coloring photographs, written by Worobiec on the English magazine Black & White Photography, called "Oil's well that ends well", issue no. 41- Dec. 2004, page 64.
-Sino.