"The Design Studio method has become one of the most success methods in Agile and Lean UX. This rapid, iterative approach blends concept creation with critique. Design Studio is a great way to jumpstart your design process, create 300-400 design concepts in just a couple of hours, or get team buy-in and ownership." via Vimeo
Having recently participated in a hack day using this process, what struck me was how effective this is in getting dozens of ideas generated quickly - once you get over the 5 minute rule shock, you can actually get a lot down and democratise the design process as everyone is sketching, not just the one who is deemed 'good' at drawing.