My most recent book purchase is _Creative Imagery (how to visualize in all five senses)_. from the back cover:

-tells specifically what to visualize, using precise, word for word images
-shows how to make imagery vivid in all five senses
-offers a progressive series of images of increasing power and complexity

it's an awesome book, 5 stars on Amazon..

You might also try some type of timeline therapy - change your own personal timeline so that you've always been able to visualize vividly..

james