Available on Amazon or here: Online Blog
Although the style of this book is aimed at a teenage audience, most of the content is appropriate for anybody (perhaps with minor amendment) provided that you don’t mind the jazzy graphics and odd fonts aimed at the target audience.
It contains a number of “experiments” – different ways of praying – and encourages you to see what works for you and what doesn’t. It also contains a feedback form for yourself, and feedback left by others.
If you are looking to find a way to pray that suits you, and don’t mind the layout (Amazon has look inside), then this is a book/website worth looking into.