Derek Lockwood has some of the most interesting and complex Bargello patterns I have seen like Mystique, Night lights and Illusion but I don't think he has compiled them into a book. I only have one book and that is Twist and Turn Bargello by Eileen Wright. It has several nice patterns in it.
Edited to add, How many different bargellos do you think you will do? If you foresee many in your future, then continue the hunt for a book. But if you think one will satiate your desire for a bargello quilt then spring for the pattern you saw that you really liked. And don't dismiss that color theme/placement can make the same pattern look totally different when it comes to bargellos.
Last edited by feline fanatic; 09-10-2015 at 11:09 AM.