I have found that rough doodles/ thumbnail sketches open up the mind/hand connection to let creative ideas flow. Rough doodling is a great way for the client and designer to communicate and exchange ideas. I encourage my clients to sketch out or doodle their visions on a graph page which is a part of my landscape planning guide on my web site and vision book. I love it when I get a doodle or sketch of their ideas, the hard part for many is to loosen up (designers like me included) and free up the hand not worrying about creating a piece of art. Doodling/ thumbnail sketching is only part of the design process. Just have fun and let the pen or pencil flow!