Visual thinking is a powerful tool. Especially in brainstorm sessions I use it sometimes as a facilitation tool.
‘The back of the napkin’ is a book that can help you to use visual thinking.
The recommendation of Dan Heath (author of ‘Made to Stick‘) is promising: “Inspiring! It teaches you a new way of thinking in a few hours — what more could you ask from a book?” — Dan Heath,author of Made to Stick
This is a blog on visual thinking!
Great short presentation on Visual Thinking: