I
 have always thought a book on immunocytochemistry  in 
diagnostic histopathology,especially if lavishly illustrated, would be 
of immense value and a good seller.

The closest I know to such a book is:

Histochemistry in Pathology
Filipe MI & Lake BD
Churchill Livingstone
1990
ISBN 0 443 04019 2

There may be a later edition of which I am unaware.

Russ Allis