Ryan Singer gives a demonstration of 37 Signals design philosophy in action. Although this video is showing the process of web app designing from concept to running code, their method can be applied in any creative profession.
Designers love to over think the conceptual stage of a project, but the faster we can get our abstract conceptual thought into something tangible, the faster the magic can start. Struggling with designers block? Start building it, and you would be amazed how the creativity instinctively kicks in.