In Little Tree I tested illustration board for its ability to hold watercolor. This is in fact a value study in burnt sienna, but it is also a finished piece. I will boldly proclaim that because it can handle no more detail and it is unnecessary because everything will get lost. Follow the Little Tree link to my Deviant Art page to see the full painting.
Blind drawing is an interesting process. It is not blind in the sense that you use only your hearing and feeling senses to detect shape and form. But for the artist it is the opposite. You see with your eyes, but feel the paper/board with your pencil or brush. In effect, you let media feel the contours of the physical object without actually seeing the the page. It always has surprising results and pushes the artist to the next level.